A guy on my team used to wrap them for all excersises.
And that includes curls, squats, and probably crunches (if he would've done those)
.
He's got problems with weak wrists, cannot support the weight in benchpress.
What he's doing right now, is to step by step remove the wrist wraps from all excersises except heavy benching.
It will take him a few months, but he's a text book example of what happens if you use wrist support too much.
With that being said, I think wraps should be used on all heavy lifts, as they actually add to the lifting capacity.
YIP
Zack