MK - This is tough, because there are several here we really like. If it's hot and we need a break, Columbia Harbour House is our favorite. We also really like Casey's Corner (great hot dogs!) and Peco Bill's. Don't forget a Dole Whip from Aloha Isle for dessert no matter where you eat!
Epcot - Boulangerie Patisserie in France is our new favorite! The food is light and delicious, and the atmosphere in France is great.
MGM - We've never had fast food at MGM. There aren't a lot of choices here, but I've read some good reviews of ABC Commissary.
AK - Pizzafari is the only counter service we've had at AK, but we did enjoy it. We all thought the food was good and the theming was fun, although it was crowded and loud.