My choices:
MK Columbia Harbor House - grab your tray and head upstairs for a quiet break. The soups and sandwiches are my favorite - fresh and good.
DHS- At this park it would be absolutely nowhere. I'd hop on the boat and head over to Epcot. But if you must eat here I would advice to never, ever, take the risk and eat at ABC Commissary.
We ate at ABC Commissary last summer and I don't understand all the bad reviews. It was a big, air conditioned building with typical burgers and they tasted fine to me. The chocolate mousse was really good.