I have no problem for about 4 hours of Disney with sockless crocs. After that, my feet start to hurt because of all those little bumps. So I just wore mine for half a day; usually the half that involved water rides!
My ds 13 has fairly sweaty feet. Crocs are amazing in that with all the air holes, his feet didn't stink. On the other hand, he wore them so much at Disney that he started to make the plastic tacky, and the bottoms of his feet were black from the black crocs. Eep!
Remember that crocs aren't supposed to be close fitting like a sneaker, and you should be fine going sockless!
NHWX