Of those you've mentioned, we've only done PF and we enjoyed it. It was my DD's 7th birthday and our last day there. We were able to take our time eating, and playing with the characters since we weren't leaving for MCO until about noon.
The food was excellent (as is their dinner) and the characters were wonderful. Mary Poppins is in the lobby. Alice and the Mad Hatter are in the room along with Pooh and Tigger. My DD7 had a great time interacting with the 3 talking characters. Since we were there about 11 a.m. we had the characters to ourselves, mostly.
Of course, now that I've told you how wonderful it is, I have to mention that PF will be under rehab this late summer/ early fall. here's the news from allearsnet.com-
The Grand Floridian Resort's 1900 Park Fare will close for rehab 7/9/07 - 10/1/07.
During 1900 Park Fare's closure, the Grand Floridian Cafe will offer a pre-plated character breakfast and dinner, "Supercalifragilistic Breakfast" and "Cinderella's Gala Feast." Also during that time, Citricos, upstairs at the Grand Floridian, will be open for breakfast and lunch with a menu similar to the cafe's. Citricos will also resume dinner seven days a week. (It is currently closed Monday and Tuesday.)
Based on that info, we won't be going there ourselves, this Sept.
Another breakfast character meal we've enjoyed is the Princess Storybook Breakfast in Norway at Epcot. While not close to the MK it is only 2 monorail rides away from MK. You could arrive at Epcot in the a.m. and then after eating head to MK on the monorail. (transfer at TC). The food is good, the princess are, for the most part, wonderful. I like the building too!
Hope this helps! Happy Dining!
ADDED-we're staying at the POP too in Sept. What are your dates?