I took DD in March at 13 months old. She had a blast! She loved all of the rides, but especially Dumbo, Small World and the safari ride. She also loved the animals at AK and the fish at The Living Seas. The parades, fireworks and night time shows were also a big hit. During our trip, she came to love the characters too. (We lived near
Disneyland and before that she only wanted to wave from 30 feet away. By the end of the trip, she was hugging them.)
DD is a sleep anytime, anyplace baby so I didn't need to adjust the touring much (it was just me, DD and my 8yo sister). Terra would sleep in the stroller and we'd do things like autographs, snack, playgrounds, etc while she slept. Sometimes I'd have her sleep in the hip carrier so that we could do rides or shows.
My best piece of advice I can give is to take pajamas with you to the park. Sometime after dinner and before she got too tired, I would put Terra in her pajamas, socks and shoes. This way, we could stay for Wishes, Illuminations, Fantasmic or just a late night at the park without having to wake her later. Once she fell asleep, she was out for the night. I could just move her from stoller to carrier before getting on the bus and then just put her straight into bed at the hotel. It made things soo much easier.
As far as travelling tips, I always carried several snacks and her water cup so that I was prepared whenever she was hungry. I also carried a baggie of cotton balls for her ears. Whenever we went to a show that was noisy or were doing something when she was asleep, I'd put some in her ears to protect them or as not to disturb her as much.
Have a great time!!!