Only you know your child and whether or not you should take him.
Our DS is 17 months old and we took him this month and last May. He loved the characters and the rides he could go on. Even POTC, which scared his almost 3 yr old sister (who talked about riding it for months beforehand

).
We have 4 kids, 17 mos, 35 months, 11 yrs, and 13 yrs. It has always been our experience that the youngest is the easiest in WDW. LoL
But that is our family.
This year, my 2 older kids were told that we would be pulling them out of school for almost 2 weeks. So, they were required to maintain certain grades, no missing school unless they were sick, and we had rules about behavior. My oldest DD13 lied, repeatedly did things she had been grounded for, and neglected her homework in favor of hanging out with her friends. She is a good student, but even so, her grades went from A's to low B's and high C's. She stayed home with her Dad, my ex.
It was the hardest thing I had ever done, but her 11-yr old brother pulled his grades up from the normal C's to B's and A's, and even with his ADD, was better behaved in the last 6 months than ever. So I could not give in and take her, after he worked so hard to earn the right to take 2 weeks off of school. His teacher was so happy with him, that she gave him a free pass on the work for those 2 weeks. He did not have to make up any assignments.
I know I am probably a mean mom, and I agonized over it (When I took her off the reservation, I cried), but since we have been back, she told me she knows why she stayed home and that she wants to go in Feb and will work her butt off in school so she can.
Anyway, for me, it was the right thing to do. And I am sure many people would tell me I am a wench and how could I do that to my DD. But it was right for us.
So if you think your son would be okay not going on this trip....leave him home.