MK- Columbia Harbour House- good food and a really cool atmosphere
Epcot- Sunshine Seasons- Yummy, healthy (healthier, anyway) food with lots of variety
DS- Backlot Express. Like others have said, there isn't really any CS at DS that's amazing or has something that sets it apart from a regular fast food restaurant.
AK- Flame Tree. Or I would just go to Animal Kingdom Lodge if you have a car. Their counter service restaurant, Mara, is pretty good, and has Zebra Domes for dessert, and AKL is a beautiful resort to go check out.
For Disney hotels, Pepper Market is good food and probably the nicest restaurant classified as counter service. I can't think of the name, but the counter service at Port Orleans Riverside is good, too.
Earl of Sandwich is my favorite place to eat at WDW, and it's a counter service , too. Unless they've changed it, you don't get a side item like chips with your meal, which is sort of irritating. To me, anyway.
