I've eaten there many times, and honestly, even with calling directly to the Hoop De Doo Revue ahead of time and notifying them there's a vegetarian in the party, every single time I have got either a boring plate of roasted vegetables or a boring plate of pasta with marinara sauce. Obviously, I don't go for the food, because every time it has pretty much sucked, I go to spend time with my family and see the show.
Supposedly you can ask for anything that they have on the buffet next door at Trails End, but I didn't know about that before.