I agree that most open for lunch around 11:00 am. I looked back and the times board photo from a few weekends ago and it listed Galactic Grill as serving breakfast until 10:30 am and Rancho Del Zocalo until 11:00 am. I think those have pretty quick change overs to the lunch menu.
The Plaza Inn is the one quirky location because it serves/seats for a character breakfast until 11:00 am and then switches to a counter service lunch location. As Malcon10t said, it usually re-open for lunch around noon.