There is absolutely no comparison between any sort of laced up shoes and the traditional ugly Crocs with the holes (Cayman style). As you stand your feet expand. With laced up shoes, even with well worn-in shoes your feet have nowhere to go. If you are going to stand all day, eventually after a few days the pain will set in and standing becomes a nuisance. I have not experienced this at WDW, but when I travel for long periods and am walking around a lot regular shoes are simply not an option. That is just for me and I am sure many people are fine with shoes, but I can't do it and it's not a weight thing as I am in good shape.
Anyway, back to Crocs...they saved my entire vacation once. In Japan while visiting various cities, Disney and other parks, my group decided to hike up Mt Fuji. This was in the middle of our trip and let me tell you, my feet were already tired from so much standing and walking but the hike DOWN the mountain simply did them in. So much pain. I knew I had to find a solution and remembered the Crocs kiosk at the little mall at Disney. I hated Crocs...made fun of them, never even considered wearing them, however I was desperate and heard of how comfortable they were. I tried them on, found one that fit decently enough and off I went. Well, the difference was simply amazing. Instantly I was able to stand for long periods and the pain of hiking wore off in just a day. INCREDIBLE!! I urged my buddy who was also in pain to get them and he reluctantly bought a pair out of urgency...same result. He was loving them and we were able to walk everywhere from city to city, standing for long periods...no pain, nothing. Any sort of blisters could only be caused by the wrong size or a different style of Croc. You might get some rubbing at the lip of the shoe, but on the inside I can't see most would get blisters since there is so much room. Anyway, to answer your question...
TO CROC!!!!
I will add that any sort of open Croc would work as well. The sandals are great, but if you want closed toe shoes for protection you are going to have to go ugly.