Everyone has pretty much answered your questions, I just wanted to throw in some dining preferences of my own.

Magic Kingdom - You picked all of my favorites, I'm sure you will have a great time.

Epcot -
Le Cellier (Canada) has WONDERFUL steak (if you like that sort of thing)
Japan - My daughter enjoyed this restaurant immensely because it's so visually stimulating, which would also be good for your toddler. They have a restaurant where they cook the food in front of you, they really involve the kids and it's fun to watch as well!
San Angel Inn (Mexico) - For nothing more than the atmosphere, the food is decent enough, I enjoyed the chicken tacos, it IS a little cramped though but you get to see the boats go by for Gran Fiesta Tour. I'm told it's like your Pirates at DL.

Hollywood Studios -
50's Prime Time Cafe - It's a great old style family atmosphere/food and it's great to see the wait staff yell at grown men to keep their elbows off the table.

Animal Kingdom -
Yak and Yeti - I've had nothing but great experiences here, food and atmosphere. However I've read some not so great reviews on this restaurant so it sounds like it's hit or miss.

Ohana (Polynesian) - Great food, great atmosphere, great fun for the whole family. I mean really, who doesn't love a coconut race in the middle of dinner?
Boma (Animal Kingdom Lodge) - Breakfast is phenomenal and dinner is great if you love spicey food, it always gets rave reviews.

Have a great time!