In MK, the only sit-down for us is the Plaza Rest. Other than that, we most likely eat counter service and save our money for...
MGM-The Brown Derby. This is our favorite "park" restaurant. It's such a neat place, elegant, a great break from the park. The Cobb Salad is our favorite dish. It's not for everyone, I've seen many families walk in, get seated, and then get up and leave. My 12 yr old LOVES this place.
Epcot-Rose & Crown-great party atmosphere; again, a nice rest from the park. Very good, always consistent, pub food. Lots of people try to get an outside seat for illuminations.
AK-We haven't tried anything except the Tusker House (BEST counter service at Disney) and Rainforest Cafe (we only ate there because we had a gift card-didn't like it!!)
Beach Club-Another vote for Cape May Cafe!! We usually eat 1 breakfast buffet and 1 dinner buffet each trip. I've never eaten at Beaches & Cream, but I read great reviews on this board and maybe we'll get to try if we can get past the entrance to Cape May Cafe!
Of course these are just opinions and we still have MANY places left to try. I hope this helps!