My wife used to cut my hair with a 0 guard buzz, but was against taking any more off. Thought it would be too radical. After about 10 years, I went for it, and now, she comments if I miss shaving for a couple days.
There was a mental thing, that taking that last 1/16th off was such a big step. But, in reality, there is such a small physical difference that most people don't seem to notice much of a difference.