I wore this (alternating every other day with sneakers) my last trip to DW and I LOVED them! they are the most comfy flip flops I have ever had and will be purchasing another pair for my upcoming trip
http://www.zappos.com/nike-comfort-thong-black-white-vivid-pink
I wear TEVA's MUSH flip flop/ sandal. It is a small wedge and is very comfortable for all day walking. I wouldnt recommend a simple flip flop though.
no one has ever worn flip flops to Disney, not sure they are even allowed!!!!
Sorry, I couldn't resist! I never take sneakers to WDW, too hot & bulky on my feet. I have Tevas, Clarks & Adidas flip flops and have never had an issue at WDW with any of them, ever.