I recently moved from Norther California to the Seattle area. I was born and raised in the Bay Area. When I told my family and friends that I was moving to the Seattle area the ONLY ones that had the "OMG, why would you leave Nothern Ca?" attitude were the folks that had lived there for less than 10 years. Most of the people I grew up with or family that are native Californians have left as well.
Most agree it is overcrowded and overpriced and better sold to those willing to pay for it as the beach, the weather and the rest of the things that everyone makes such a big deal about are very overrated.
The ocean water is about the same temp as the beach here in WA.
Beach towns do NOT get the same sunny weather they get in the valley, it is usually socked in with fog untill 2-3 in the afternoon and cold.
paying 1mil + for a house that is nowhere near a beach, stacked on top of your neighbor and no different than any other suburb in the US is ridiculous.
It rains through May usually.
It is still cold in December (although sunny)
2 seasons, late fall and Arizona.
I could weave a blanket about So-Cal as well.
Bottom line, I always laugh about people that talk up California like it is the end all of existance. It has its complete crap points just like everywhere and its beautiful points as well... If you are willing to pay 2x of what you would pay elsewhere to say you live in CA, it is the place for you.
Agree with most points here, Marz.
Like you, I was born and raised in the East Bay. Loved it. Though I think you're way off on the weather portion of your post, more on that in a minute....
Overcrowded? Yes. Which I guess is a result of it being a popular place to live. Like Seattle, being by the water limits the amount of land you can build on. I hope you didn't leave the Bay Area hoping to escape traffic. Seattle's traffic is no picnic for the very same reason.
Overpriced? Undecided. Supply & Demand economics. A house is worth whatever you can get for it. See my response on overcrowding.
Attitudes? Interesting theory. Like the original post that started this thread and the reason I responded, people are going to take pride in where they live (or in your case, moved to).
Water Tempature? True. However, contrary to the perception of some in other parts of the USA & rest of the world, not all Californians surf.
Weather? Rains through May?

Doesn't sound like you believe in global warming. Oh wait I forgot, the
lack of rain AND overabundance of rain are BOTH caused by global warming.

2 seasons...fall & Arizona?

Ever heard of the term "microclimates"? During the summer months, there can be as much as a 40 degree difference in temperature in only a 20 mile drive (San Francisco to Walnut Creek). Marin County, the Central Valley, the East Bay, the Peninsula all have very different weather. Where I grew up (Alameda) it rarely experienced extremely highs or extreme lows. Some people may hate that, others find it ideal. Personally, I like the heat, which is why we lived in the San Ramon area before we moved near Sacramento.
The reason we moved to Rocklin, CA had a lot to do with lifestyle and the related cost. We wanted to have kids and the idea of The Lovely Mrs. Schro staying home to raise them. It was tough to do where we lived and still have a home big enough for us and what we wanted. When we moved from Dublin, CA in June 2000, our home sold for $250 a sq. foot. Even after the recent downtown, our original home is still estimated to have a value around $385 per sq. foot. So, if it were overpriced, we would have seen a market correction in the Bay Area only.
When we bought here in Rocklin, our total cost was approx. $106 a foot for a 3,200 SF home. Today, it's estimated to be $187 per SF (though I think that might be a bit high). However, that's not extremely critical to us in that we don't plan on moving soon. We had a totally different reaction from people we spoke with after we moved here than you. Almost universally, the reaction was "You are? WOW! We thought about that, just didn't have the guts to do it".
On a side note, my aunt & uncle lived in the Mitchell Hill area outside of Bellevue for 25 years (recently moved to central WA). In the early 90's, they bought my parents' minivan b/c they needed it to help care for my aunt's mother. Anyway, she was shocked how many Seattle-ites would cut her off and not let her merge onto highways b/c of her California plates. She said people up there hated Californians.
There are a ton of reasons why we love it here in Rocklin. The schools are highly accredited, proximity to Lake Tahoe (only 2 hrs away instead of 4), my work from home arrangement, access to golf, the friends we have made here, the sun coming up in the morning over the hill in our backyard, to name a few. However, there are a ton of things we miss about the East Bay...professional sports (HATE the Sacto Kings), the Livermore Wine Valley, family, the weather (although it's pretty nice here in Rocklin), proximity to the bay and the coast.
Based on your post, I'm guessing "weaving a blanket" about SoCal would mean ranting. I can honestly say that I know a few people that view SoCal beach cities as the greatest place in the world (Robmeister's point). I am not a huge fan of SoCal (actually hate LA). The variety that Northern California offers is great. You could ski in the morning, and play 18 holes of golf in the afternoon (although with Mammoth Mountain in SoCal, you could do it down there also).
Although we did leave the Bay Area, we stayed in Northern California for many reasons. We love it here. Is it the "Be All / End All"? Since we haven't experienced everything the USA has to offer, I can't say. For anyone to call their place of residence "the greatest place in the world" without experiencing everyplace in the world is pure hyperbole.
Do we plan on staying here the rest of our lives? Who knows.