We really enjoyed the food at Ariels' Grotto, but, it's not an every trip thing for us due to the expense. (It's one of those "been there, don't need more princess pics" things for us) I wish they would offer the same food for a non princess interaction at a lower price. Don't get me wrong, I love the princesses as much as anyone, but, you are paying for face time.
Tastes Pilots (counter service) has some good food, but the lines can get long.
Usually on or DCA day, we head over to Whitewater snacks (you can enter through the entrance through DCA into the Grand Californian) and walk down a little walkway and turn left. Food is made to order, very good, and not expensive.
Wine country has some great food too, but, like lulu said, not sure it will be open then.