I think I have done all of these!
Favorites and Why:
Donald's Breakfastasaurus on a none EE day. Do not do this on an EE day it is just too hectic there. We have always had really great food, a good variety and super character interaction. The CM's there are really into thier roles as well and make this a great fun breakfast. Try for an 8:10 PS and you'll hit the park just as the ates open to everyone else.
Crystal Palace is a great lunch, lots of variety and the best place for the Pooh characters. It is a great respite from the hot park as well. Character interaction is great, get a PS between noon and one--it usually doesn't take more than 15 minutes beofre you will be seated. If you do this on an EE mornign you will have time to have accomplished much before lunch, and you will need a break in air conditioning.
The Garden Grill is nice, it is served family style in a skillett. The characters here are very friendly--Micky, Pluto and Chip and Dale. I have done the Ice Cream Social (which is held here also) and really don't recommend it. For just a few dollars more you get a full luch and great character interaction. JMHO but you mention Beaches and Cream--go there from the International Gateway on a day you plan on being at Epcot and enjoy great ice cream and a break form the park! Especially if you plan having a meal at the Garden Grill. I've eaten here both early lunch and late and time really didn't matter.
Liberty Tree Tavern Excellent family style all you care to eat. The food and character interaction are top notch. Eat early here so that you will not miss the Spectromagic parade/FIS. This is the only place you can dine with Daisy!
1900 Park Fair is a good breakfast with fun characters (Alice, Mad Hatter, Mary Poppins). For Dinner it is Cinderella, Prince Charming, Suzy and Perla Mouse, the fairy godmother is in the lobby. It is an excellent choice for breakfast on a MK morning since you can just take the monorail to the MK. Same for dinner, leave MK on the monorail and head over to GF and then head back to MK for the evening. We found that early for both of these worked best for us. Things were just getting crowded and lines at the buffets were becoming longer as we were departing.
SCI FI the atmosphere here is the key. They make great burgers, fries and shakes--anything else is a gambel IMHO. Plan on about $15 per adult for the burger fries and shake and $8 per child. If you desire all the glow in the dark extras they will add up fast.
Fantasmic Dinner packages area great way to avoid the long lines and pushiness of lining up for Fantasmic. They are available at Hollywood and Vine a rather unremarkable buffett but the least expensive of the packages. Mama Melroses is Italian food and The Brown Derby is very gourmet. For these eat early so that you can be at Oscar's no later than 8:30 to head to your seats.
Feel free to PM me if you have any other questions!