If you want to know what people think about WDW food, you came to the right thread!

Seriously, you could read the dining reviews on this thread for the next 6 months and get lots of ideas, but I think the bottom line is that Disney provides lots of opportunities for memorable, delicious meals, both in the form of character breakfasts and at regular restaurants. Don't forget about counter service options, too. You won't get to meet characters, but Epcot has some amazing counter service food. While in Epcot, I'm not even sure you need ADRs for any restaurants (which is a shame since they offer some of the best table service food, too). The counter service at Sunshine Seasons is wonderful and there are lots of choices for all taste preferences. We really like the fish and chips from the counter service in Great Britain. The French bakery has lots of sandwiches and a cheese plate that is absolutely superb (plus lots of yummy dessert options). We like Tangeriene Cafe but also love Middle Eastern cuisine.
As far as character buffets, I'd say obviously those are more about the experience. The Akershus buffet gets good reviews, especially at breakfast. My understanding is they have a cold buffet and then bring you a family style platter of hot items. It sounds like it is the best value for a princess buffet. We loved Tusker House at AK for the Donald's Safari character breakfast. I have read some not so great reviews of Tusker House for lunch and dinner. We also really enjoyed Crystal Palace at MK for lunch buffet with Pooh and friends. Depending on what hotel you are staying in, you might find it nice to do a character buffet at one of the resorts. We like Cape May character breakfast with Minnie and friends.

There are just lots of great options. Good luck and keep as posted on what you decide! Oh and I don't think all of these need to be booked 180 days in advance. You can get in to many of these buffets with much shorter notice, at least this has been our experience.