MK - Columbia Harbor House = Good menu selection and great place to sit and cool off upstairs.
MGM - Rosie's All American Cafe = Standard burgers, chicken strips and pizza, but the best thing is that it's close to RnRc and ToT.
Epcot - Tangerine Cafe = Morocco has some of the best food in all of the parks.
AK - Flame Tree BBQ = Some of the best ribs at WDW. I've had better in my travels but not at WDW. The views are great also. The only downside is it is all outside, if you're looking for some place to cool down this isn't it.