I love my crocs. I have bought very expensive New balance walking shoes, with very expensive special arch support inserts...hurt my feet after one day at Epcot. I bought a very expensive pair of running shoes, recommended by my marathon runner husband, and they hurt my feet after a 30 minute walk. I can wear my crocs, or croc flip flops if it is warm enough, all day, every day, touring WDW or anywhere else, and not once have my feet hurt.
People may tell you that crocs are not good for your feet, and that may be true, I don't know. Shoe salesmen in particular (who coincidently do not sell crocs in their store) love to tell me I need a "good supportive" shoe. Well, when I find one that is comfortable all day, that's fine. Until then, I will wear crocs.
Give them a try, see if you like them.