I actually find that I flinch a lot less if I don't know it's coming... snake bites (as a generality of course) aren't really that bad for nonvenomous species commonly kept as pets and under about ten feet. The damage is generally done WHEN you yank back, pulling your skin across the teeth and ripping yourself open a bit more. If they bite defensively while I'm not paying attention, half the time I don't even realize I've been tagged until those tiny little blood droplets appear.
I get bit quite a lot though... so maybe the reactions deaden with repetition.
"Genes, Like Leibnitz's monads, have no windows; the higher properties of life are emergent... And once assembled, organisms have no windows." - Edward Wilson, Sociobiology