Kathy,
DH & I went last June, and I took my old trusty leather reebok tennies, a pair of keds filp flops and a pair of Clarks.
Let me say that none of these shoes had ever given me blisters before this trip - but in the end my feet were Miserable.
We had moleskin with us, and that was my saving grace. This year, after much research, I have invested in a pair of Nike Air shoes (cloth w/ mesh, not leather, which hold heat in) and a new pair of Clarks Springers athletic sandals, more moleskin and bodyglide for the feeties. The coolmax socks didn't do alot for me last year, either. This year I am taking several cotton pairs, the low ones, and ankle height.
I learned alot from that last trip and my poor feet made me promise I would not torture them again this year.
Also, I think from the heat coming up off the pavement in WDW, I had this nasty ankle rash/sunburn type of thing. ( but was wearing sunblock. It was like a patchy rash/ sunburn, ankles only.) Still haven't figured out what that was, but it has happend twice now and only at WDW. Has this happened to anyone else?
Best of luck to your feet.