DD was 2 1/2 when we took her, and she had an absolute blast. Five months later, she still brings it up every single day.
We didn't do naps in the room either. We tried one day (before
MNSSHP) and that was the only day she had a total melt down. She did finally sleep a while, but it was a bit of a nightmare. She was happy just snoozing in the stroller or on a ride. I sat with her a few times and just held her and people watched. Then she was ready to go for a few more hours. We didn't burn the candle at both ends though. An early morning meant an early return to the room, and a late night meant we slept in the next morning. Getting her to sleep at night was no trouble. She conked right out and didn't move until the next morning. She was, however, rearing to go the next day.
We stayed at CBR, and the beaches were nice at the end of a day. Also, the Disney cartoons in the rooms were a lifesaver. I think they're on channel 96. We woke up and went to sleep with the cartoons every morning. We actually skipped Fantasmic because she wanted to go back to the room and watch cartoons!
We did the
DDP, and that was nice, since we rarely wound up paying for her to eat. I took Pop Tarts (she'd never had them before that

) and some sacks in our luggage (and lollipops in the airplane to help her ears). Then we used snack credits to pick up some fruit to keep in the room. I also had Garden Grocer send some water, juice, and Horizon brand shelf stable chocolate milk in the individual cartons. She was thrilled with her breakfast of Pop Tarts and chocolate milk every day. She even occasionally munched on the fruit.
She loved the costumed characters, but got a little shy around the face characters. We did family movie night for a few months leading up to our trip. I'd make a themed dinner to go with the movie, and she got familiar with the characters that way. And like PP, she enjoyed most of the rides. We left It's Tough To Be a Bug because it was terrifying though, and she was a little concerned about dark rides after that (although she went, and generally enjoyed herself).
I think that's about it! Okay, I wrote a novel, but we had so much fun! Just go with the flow and follow your LO's cues. Have a great trip!