Hmmm.... one that wont break the wallet? Not sure there are any! But, reasonable with very nice atmosphere is Grand Floridian Cafe.
Ale and Compass is a good option too, but I like the atmosphere at GFC better. Just brighter and happier
A&C is pretty dark, like the Wave at Contemporary if youve ever been.
Most inexpensive is probably Beaches and Cream at the Beach Club. They only serve burgers/sandwiches/ice cream, but they are all very good.
Not sure if it will be up and running, due to it being a buffet, but Boma at AKL is always good too, at a reasonable price.
Those are my wont break the wallet (too much) resort table service restaurant picks! You can always pick any restaurant and just order drink/appetizer or dessert and coffee too. All deluxe also have QS/lounges (apps and drinks) Polynesian has the pineapple lanai outdoors for an ice cream/dole whip. Hurricane Hannahs by the BC/YC has cold sandwiches/specialty drinks. Contemporary has Sand Bar grill by the pool, available to anyone, for just a burger/hotdog! Boardwalk Bakery had cold sandwiches/pizza. You could check out the Boardwalk Inn, BC/YC/Swan/Dolphin while there and end up at Beaches and Cream to go for an ice cream