I ate at 1900 Park Faire for dinner earlier this month and won't be back.
The character interaction was lousy ... it took a long time for the 4, count 'em 4, characters to make it around the mostly empty tables. Once at our table, they were nice but it took probably close to an hour to see them all.
The food was, well, terrible. The buffet was not replentished often and the food sat in the chilling in the "warming" trays. We were there for oven an hour and I never saw the tiny bit of crusty bread pudding replaced. The soups were OK, but the rest was farily bad including the prime rib. Yuck.
I would pick Chef Mickey's or the Crystal Palace over 1900 PF anytime in terms of food and characters. If you really want to see a princess, go to the Epcot Princess Breakfast in Norway.