We've tried most of the places at Epcot and we probably like Chefs de France for lunch better than some of the others. Our least fav is San Angel Inn but we are from California where there is good authentic Mexican food on every corner. If I can get the first ADR of the day at Coral Reef, we eat there sometimes too (but only the earliest ADR as the place gets backed up and too noisy as the afternoon goes on). Le Cellier is by far most people's favorite.
At MK, we usually do counter service or go to Liberty Tree Tavern but that's because I like the salad they offer, not sure how the rest of my family feels about it.
I'm the one on hold making the ADRs so my opinion counts more than anyone else's.
If I were going to leave the parks, I'd probably go over to the Contemporary and eat at
the Wave on my MK day and at Epcot, I'd go over to Beaches and Cream at the BC for a hamburger and shake.