Last time I was at BWI, no need for wristbands.
I have an aversion to wearing them and can totally understand it. I don't mind them so much in general, but Disney puts them on a little too tight for my taste...it is like a wrist claustrophobia. Hard to explain if they don't bother you.
I dislike them especially when swimming. Not bad if put on the suit, but if they are on your wrist, they create resistance as you move your arm through the water.