Regarding breakfasts, who is your dd favorite character. If she likes the Princesses, Cinderella's is the place for you, but ressies are hard to get. For those you need to call 60 days in advance right at 7:00 a.m, they are usually sold out by 7:05. If she likes Pooh & Friends, Crystal Palace in the MK is nice, but I heard that the Breaakfast at Old Key West, I think it's Olivia's does aa nice job and isn't too crowded. If Mickey is her fav then I suggest Chef Mickey's.
Yes, usually the first Saturday in June is unoffically "Gay Day" in the Magic Kingdom. If this bothers you, I suggest you avoid MK that day. I know there is a website that gives a timeline for the events scheduled, but am unsure of the address.
We usually do Epcot first, then MGM, then MK. The kids like MK best, so we put that off a little because it becomes a little anticlimatic for them if we do MK first.
Hope you have a great time, we'll be there in June too, just a little later than you.
Robin