We walked up to Plaza today and had lunch. And here are my thoughts (Note: it's been a while since I've eatten there)
We got there at 11:30. We were told it was a 30-45 minute wait. They text you when your table is ready (pagers are also available) and you have to come back within 15 minutes of receiving the text. If you change your mind, you just text them back. 30 minutes was an overstatement. It was more like 5 minutes. When we left at 12:30, there were empty tables.
We just did entrees (no appetizers, no dessert). My parents had the Plaza Club, which was plenty for them. I had the Chicken Sandwich, which was very good. My brother had the kids grilled chicken strips (not breaded) and liked them.
There were too few fries, and they downed the quality of the fries. They were fine, but nothing spectacular.
Bottom line: the food is good, and it was nice to take a break from the park for a while, but not worth going out of your way for.