If i remember correctly, wasn't there a special needs child who rode Snow whites scary adventure a ton of times and was the last one to ride it?
Yup, that would be my son Benjamin. (Shameless self-promotion: I wrote a book about the whole thing, there is a link in my signature below if you are interested).
Over the past ten years I have met several other families who bring their autistic children to the park. Sometimes it is a good experience, sometimes not so much. On balance with Ben it has been an overwhelmingly positive experience, but there have been days when it has been not great for anyone.
There was one occasion in particular when Ben started randomly hitting and kicking strangers in line for Peter Pan's Flight for no apparent reason, something just triggered him and he became openly hostile. From the middle of the line I had to physically pick him up and carry him out of the queue while holding him in a bear hug to contain him. I heard more than one person make disparaging comments aimed at me for being a terrible parent, abusing and manhandling my child like that. In the moment all I could do was contain my child and prevent him from harming anyone else, and I really didn't have the time or energy to explain things to random strangers. If someone had gotten in my face just then, I might well have fit right in here with the other bad experiences people are describing.
My points being:
1) You never really know the full story of anything that is happening around you, so perhaps don't be so quick to judge.
2) Families with autistic children are just like any other families with children - sometimes we have good days, sometimes we have bad days, most of the time going to Disney is an awesome experience, but some of the time it is just hellish.
I really do try to give people the benefit of the doubt and assume positive intent. We are in the parks all the time, but for a lot of guests they have spent a ton of money for a very short time on what will probably be their one and only trip to Disney. They are under a lot of pressure to get the most out of their trip, and people under pressure tend to break in very unpredictable and unflattering ways. It doesn't make it right or okay, but it is at least predictable and understandable.