The first time we took the kids to Disney World was August 2012. DH got himself comfy sandals, and I got myself a pair of Crocs - but they were more of a "strappy sandal" type.
After the first day's torrential downpour, poor DS's sandals were soaked through. We got him to wear a pair of his sister's flip flops (and he grumbled the whole way to the parks) because the Poly gift shop was still closed before rope drop.
We hit DHS and after signing him up for Jedi Training, we hit the nearest gift shop and got him crocs.
This year he has requested a new pair (which, thankfully, buying ahead of time will not be the $51 we paid in park) because he loved them so much.
I'm going to get a second pair of the crocs I had last time, but in black or brown instead of white this time.
Super comfy!