Not everybody is that absentminded. I think each individual just needs to find something that works with their style. For me, I have never fallen over because I was clipped in.

Oh, and as far as crashes? About 50-50 there, but it's hard to analyze, because in my experience, stuff happens so fast that there isn't time to consciously think about doing something, much less remember whether you actually tried to do it. Put it this way, about half the time I find that I've come out of the clips, about half the time I find that I haven't, and so far it hasn't made any difference.