I would say Joe's Crab Shack, but the last time we ate there we had lousy service. Our order was lost and no one could help us until my son-in-law demanded to speak to the manager. Tortilla Jo's is OK, but their service can be lousy. The best places we have eaten at are the Rainforest Cafe, service and food was excellent or Mimi's.
Do they have real sopapillas? I haven't had a real one in forever! In Oregon it is just a flour tortilla fried and topped with cinnamon or jam
When we met my dad at Disneyland one year they ventured off for the day to some museum/mini themepark and ate at a chicken pot pie place. Three years later my dad still talks about it! He said it was nothing special on the outside but the food was great and prices reasonable. Someday when I'm down there I will figure out where it is.
The only museum/mini themepark that comes to mind is Hobby City on Beach Blvd south of Ball in Buena Park. I don't know about the pot pie place though.
La Casa De Garcia-Like home-made Mexican food, and really cheap.
Monday thru friday 11:00am-2:00pm they have a buffet for only $7:00 per person, and the drinks are like a quart. Good food. It's not fancy, but it's really good.
Go down Harbor, make the right turn just before Target. It's in a little strip mall.
A place my family likes to go to is the La Palma Chicken Pie House. It is good and very reasonably priced. The only downside is it has really random hours. It is on La Palma (obviously) and Euclid up the street from the Chris and Pitt's DisneylandDaddy was talking about earlier.
EDIT: I found this that tells you exactly where it is located