My son is HF PDD. We just returned from our trip on 6/3, yes just last Sunday. We have been to WDW 2 other times as well. We went when he was 5 and at 8. He is now 10. Each trip provided a new experience.
Disney is so "real" to him. We finally figured out that it is the villains that bother him...but that was not always the case. Next, we really discovered it's the closed in, dark places that bothers him the most. He loved and I mean loved Fantasmic. And it is so scarey. I bought a package of earplugs from Eckerds. He would turn to me ask me for them if he had any concerns. He wore a hat that he could hold over his face and peak around if he wasn't sure of what was to come. Sometimes I was afraid we were torturing him, but he would always seem fine afterwards. He can be hard to read...he won't do Snow White and Peter Pan...but loved Fantasmic! Go figure!!! He preferred having a means of escape I suppose. But don't we all in certain situations?!
Here are my tips:
1. Take seveal sets of earplugs and show him ahead of time how they work. I still had to put them in his ears for him.
2. Take something for him to hide behind, like a hat.
3. Don't force him do to attractions. Or, let him know that at the last minute he can leave. The CM's are very understanding.
4. DO GET A GUEST ASSISTANCE PASS - The one we had, allowed us to go to a place to wait at each attraction. We told Guest Services that he was Autistic and we would require the pass. If my son got inside and didn't want to do the attraction the CM would show us a way out where he and I could wait for the rest of our group. Hint: on the simulator rides, you can ask to view the movie of the simulator without having to feel the motion of the ride. There is a place they will put you for this. Unfortuantly, when they told my son they'd have to close the door for him to see Star Wars, he decided he wouldn't watch it.
5. Do rent a double stroller in the parks. They are large and may even hold 3 children. We rented one when my kids were 5 and 7...it sure saved us and them. We now, even envied the parents who could still use one. LOL Don't think that your 8 year old is too old to hop in for ride sometimes too. Everyone gets very tired. Hey you may want 2 double strollers!!!
Relax, take it easy, and you know your child...but he may surprise you. Just enjoy and let your other children enjoy too!!!

I know it can be a hard balancing act, but it is so worth it! Just go with the flow and enjoy!!!
