Some of D's favourite things were not the most exciting! He kept asking to visit the animatronic crocodile outside the Rainforest Cafe (!), totally loved the Alice in Wonderland maze and we must've visited the Monsters Inc area (where you can shout into the screaming canisters) about 10 times in 3 days!
Buy the Digipass if you are planning to do character meets
I think ours cost about 40 euros for the whole trip and for that price you get digital files of every photo the professional people take when you meet characters. They typically took at least 5-8 photos at each meet-n-greet and the quality was way better than what I took on my own camera (see below example - mine on the left, theirs on the right!!). Definitely worth it if you're planning to meet a few different characters during your trip.
Don't bother with buses if in Disney hotel
All the hotels are pretty similar - choose cheapest!
Go up in the hot air balloon
We did this on our last day and D had been looking forward to it all holiday as we walked past the balloon every day. It was a fun way to see the park from a completely different perspective and D was mesmerised :)