The Plaza Restaurant really isn't a dinner restaurant in the true sense of the word. The menu is pretty much limited to burgers, sandwiches and desserts. They're good burgers, sandwiches and desserts, mind you, so if that's what you want for dinner then I'd say it's a good choice. Take a look at the
Plaza Restaurant menu. One of the menu items is a fresh vegetable sandwich. All Disney restaurants will bend over backwards to accommodate special dietary needs. If there's nothing on the menu that suits your vegetarian, you can call ahead of time and they will make something.