The muesli table had yogurts, nuts, and dried fruit to eat your oats with. It also had butter and cream cheese for the breads.
The bakery section took up two tables of Danishes, croissants, muffins, doughnuts, and other breakfast sweets. This was Harper and Sydney's favorite table. Sydney loved the croissants and said they were some of the best she had ever eaten. (She has not been to France, though, so I do not think this is a valid opinion. :) )
Do not be afraid if you or your family are not very adventurous. You can stick with something normal like bagels, and the waiters bring around a big plate of American specialties for each table. This includes scrambles eggs, bacon, sausage, and a potato casserole. I really suggest you at least try the Norwegian food, though. I found something new that I liked, and I'm sure you would too.
I really enjoyed our Princess breakfast. It is a great alternative to eating in the castle, and is considerably cheaper. The food is great, the servers are really interesting to talk to, and the kids will love seeing the princesses. Plus, you get to get into Epcot before anyone else. What more could you ask for?