Hello,
Here are some of our favorite counter service stops :
MK:
Pecos Bills - the burgers and fixin's bar are a cut above the rest. Can get crowded and noisy.
Columbia Harbour House - I love the fish baskets here, and they also have chicken. Upstairs seating is usually very relaxed.
Pirate & The Parrot - Tasty tacos and similar fare
Epcot :
Yakitori House, Japan - Nice selections, reasonably priced, limited seating however.
Cantina de San Angel, Mexico : tacos, burritos that are a step above taco bell fare. Outdoor seating on the lagoon.
The little shop in Norway ( can't be sure of the name, think it's Kringla Bakery) - Has sandwiches, and fantastic dessert dishes. A nice choice, with covered outdoor seating.
Animal Kingdom :
Flame Tree Barbeque - great eats, see if they still are running the meal voucher program, makes for a good deal.
MGM :
ABC commissary has a nice varied selection for a counter service place. Lots of seating available too.
Hope that helps,
Take care,
Bill