My DD and I wore our Crocs the entire time at WDW two weeks ago. Never got a blister and they were great after getting wet in the rain, on Splash Mountain and Kali River Rapids. When they got dirty - just wiped them clean. They were great at the Blizzard Beach too. Some people think they are ugly but I'll go for comfort anytime! I teach school and I'm wearing them to school next week. The kids will love the colours and I even have an apple jibbitz I found at the Croc store at the Orlando airport. I think they are fun to wear and my daughter refuses to wear anything else.
I say try them before you go and honestly do you care if some people think they are ugly - I don't!!!!!