In reply to Oceanrower:
Well - Somebody who's more into it than me might be able to put it better, but as I understand it, there's a certain comfort in surrendering the power of choice. I've heard one woman give an account of feeling scared in a dentists waiting room, so she put herself in "sub mode" I guess you could call it, and then [she said] the fear and trepidation ceased to be her problem.
In my case, I find choice problematical in day to day life. For every possible action I might take I can usually think of ten or twenty ways it might go wrong. Anyway, sometimes life leads you into situations where there are no alternatives. Like abseiling from an anchor you wouldn't hang washing from, because it's all there is, or prusiking up a rope with a leg that bends sideways because there's no other way to get back to the belay.
Anyway There's a quality to moments like these which is both scary and tremendously liberating. Choice is someone else's problem. I suspect that someone better adjusted to life in general, might see it differently.
There are other things too. People talk about being in the moment, but unless you spend years meditating in a dark room to the light of a candle flame, I think one of the few ways you can achieve that is to be in a situation where you believe you might cease to exist in the next moment. It's a feeling that you can only appreciate in retrospect, but there's no doubt it's intensely life affirming. the thing I love so much about climbing, is that you can feel that way without gunfire