She absolutely LOVED it. We had done a "practice" vacation at 14 months to San Jose (not quite a 2 hour flight from us) and she did amazingly well. We chose to get a flight with a layover since this gave her time to run around for a bit. I think this worked out better for her, she slept most of the way on both flights, each way. I also tried to make sure we'd be on the planes for nap time.
She was really great with the characters, too, but didn't want them touching her lol! She also tried giving Minnie a chewed up straw wrapper and seemed miffed when she didn't take it.
Here are the only hints I can think of: bring LOTS of spare clothes; have prepackaged snacks; bring a new/interesting toy if you plan on sitting down for shows (or go during nap time-she never wanted to sit still for an entire show); take time out to use the different play spots in each park, this was her favorite part. Rides/attractions she loved: Dumbo and anything like it (Triceratops whirl, for example, in AK was well enjoyed), Country Bear Jamboree, any parade (waved Hi to everyone), Peter Pan's Flight, Small World (of course lol), Safari at AK, Toy Story Mania (though it's REALLY jerky, I had to hold her in place and protect her head from smashing into the car). She did NOT like Voyage of the Little Mermaid (no idea why) or any of the 3-D shows, but she was okay with POTC and Haunted Mansion (yet Ariel made her burst into hysterical crying. . .?!)