Minnie's! You never know who might pop up. We are WDW vets too and it is our favorite of any character meal at both WDW and DLR. We typically see Hook, Fairy Godmother, Max, Minnie, Chip or Dale or both, and a Pooh character or two, but there is usually at least one surprise. Rafiki is pretty common, but we don't always see him. Over the past several years, on different visits we have run into Alice, Mad Hatter, Tweedle Dum, Brer Fox, Mary Poppins Penguin, Pinochio, Gepetto, Susie (mouse from Cinderella), Perla (mouse from Cinderella), and probably a few others I am forgetting. Even if we just have the standards we typically see with no surprises, it is still a lot of fun!
We used to enjoy Goofy's but a few years ago they standardized the characters and we have not been back since. It is just like any character meal you can go to at WDW. Unless things have changed it is almost always Goofy, Minnie, Pluto, Chip and Dale. I think Mickey might occasionally show up.