I voted for Chef Mickey's. The atmosphere was fun, and I thought the food was pretty good, especially for the mass amounts of people they feed.
I also LOVEDDDD O'Hana for the character breakfast. Our table was at the window and we had a panoramic view of the Contemporary, the rest of the Poly (pool, etc), GF, and all of MK like the castle, the mountains, everything! And the food was delicious. It was amazing.