Air Conditioned QS at each park:
MK: Cosmic Rays, Pecos Bills, Columbia Harbor House (upstairs is usually not crowded as well), Pinocchios
Epcot: Electric Umbrella, Sunshine Seasons, Yakatori House (Japan- it is small though), Liberty Tree Tavern (America)
DHS: Pizza Planet, ABC Commissary
AK: Pizzafari
I added red to my favorite in each park but that has a lot to do with preferences of each person. i did not highlight one for AK because I don't care for their indoor eatery.