Plaza Resteraunt is one of our favorites. It seems to be in the middle between the counter service food (which might not be as hot and fresh as we'd like) and a more expensive, full meal. I wish there were choices like this at other parks. This has excellent quality and full service that is pretty quick. The salad has chicken, nuts, strawberries, and we love to split that and split a sandwich. There are no entrees -- soup, salad, and about 6 hot and cold sandwiches, as I recall. Also, good fries or very good potato salad.
We've never tried to make a PS, but have stopped many times and waited for a table (no more than 10 minutes in less busy seasons, even when they say it's longer).
You can also drop in here for an ice cream treat, if you don't want a meal.