Favorite place at MK? Well, it doesn't have the best food, but it has OK fast food. Anyway, we just tried Liberty Tree Tavern and enjoyed that. So that's my answer.
Favorite place at Epcot? Man, I may be in the minority here, but I love the Coral Reef. I know others have had bad experiences here, but I never have. The food isn't perfection, but the atmosphere totally is.
Favorite place at MGM? WIthout a doubt, the Hollywood Brown Derby.
Favorite place at AK? Well, it doesn't have much in the way of food, but Tusker House was OK.
However, our absolute favorite places are at the resorts...V&A's at Grand Floridian is the best food there period, but Flying Fish is great (Boardwalk) and Artist Point( FW) is as well. Also, JIKO at AKL! I know Boma is more popular, but I am not as much a buffet gal, although I agree Boma has good food.