Ok, first, that association of a shaved head to a cancer patient is absolute bs! Shaved heads are very common and mainstream today. Just another trendy haircut.
There is very little difference between a no guard buzzcut and razor shaved. About three days growth I would say. The big difference is the feel of a totally smooth head. It feels awesome and that smooth feel is why so many of us shave every day.
Yes! Razor shaving is alot more work to maintain. I have a full head of hair, and I can shave it completely smooth in the shower in about 10 minutes. I think you should give it a try a couple of times to see if you really like the feel. If you don't like it, it only takes about 3 days to get back to the no guard length. Be prepared though, a razor shaved head is like nothing else!