We did Minnie & friends breakfast at the Plaza (I think it is?), and it was great. It was a buffet. We were probably the first seatings (we were on East coast time so were up since 4am) and it really worked out well to get in there and basically be in before rope drop.
There were a lot of characters. Minnie, Chip & Dale, Perla (Cinderella's mouse), Rafiki, White Rabbit, Capt'n Hook, Tigger, I am forgetting even more. The place was pretty empty so they came around to us a lot, but it was filling up quite a bit when we left.
We also did the lunch w/Ariel and the princesses - Snow White, Cinderella, Belle, Sleeping Beauty - which was a good way to knock out all of them at once (except Jasmine, who DD1 told us she "had to meet" 4 hours before we left! Oops!). That one was way more rushed and a system for them going through all the tables. But you can also wait to go through the Princess Line wherever they are in the Park. I think they have a specific spot but I can't remember what it's called!
I definitely thought it was worth it to "meet" all those characters in one place.
"Every mother needs a wife." - Amy Poehler, Yes Please