I just returned from the foot doc, very bad heel pain. I have tendonitious in my Achilles. I was wearing birks when I went to the doc and he said they are very good shoes and give you plenty of arch support. I asked him about croc's and he said well they are ok if all you want is a cushion to walk on- but don't have any good support..
He said keep wearing the birks...I do think it is time for a new pair though..got to get them broke in before the end of September...
I have worn mine in the rain, not by choice, and they do dry out in a couple of days, make sure you seal up your cork beds before you head down for WDW.
Bev