I'm sorry, but this is such a weird take.
I have a child who struggles with his sensory issues related to autism. He uses a
DAS. He LOVES being at Disney parks. If he is there, and not being stressed by something, he is smiling and happy and cracking jokes and puns with his brother (also autistic). When we have to renew his DAS, we have JUST arrived. Nothing has caused him stress yet. Why wouldn't he be smiling and happy and talking about his day?
Unless we arrive and its 100 degrees and the sun is blazing in his eyes and the band is playing 10 feet away, and the person in line in front of him is screaming or yelling and people are crowding him and bumping into him, he is not going to be in distress.
The line for DAS is typically 2-5 minutes in length. It's single file. People are not all up in your space. It's outdoors, usually under shade. It's not a situation that causes issues for my son. This is also how we can manage to wait in lines for food carts, photo pass pictures, and literally every other short, outdoor line.
DAS users are not incapable of waiting in ANY line. They usually are incapable of waiting in specific types of queues, for a specific amount of time. My son, for example, can handle a queue up to about 45 minutes as long as it's fully outdoors. He can handle about 20-30 minutes indoors in a mostly single file line. He starts to get agitated in switchback lines indoors after about 10 minutes. He cannot stand "holding rooms" and when a ride has those we have to stand all the way in the back corner, away from everyone. He will often turn around and face the wall so he can mentally lose the crowd. He can't stand to have people bump into him. It causes a startle reflex. Sudden loud noises like a kid screaming or crying literally causes pain in his ears and he also startles. Imagine if every sensation was magnified 10x or more, all the time. Then imagine being in a crowded, long attraction queue. It's hard to manage that all day long. These are involuntary responses and something we have had to work around for my child's whole 17 years of life so far. We have missed out on a lot of experiences because of it.
We have tools he uses in the parks to help mitigate these effects. He has ear defenders and earplugs, a hat and dark glasses, something pleasant to smell if bad odors are nearby, a cooling towel for when it's "too hot" (which to him is like 80 degrees). However, it's nice to be able to not have to worry about potential sensory overload in every attraction line. It makes our day more enjoyable and allows us to spend more than 2 or 3 hours in the park. It's not perfect, though. The meltdowns still occur sometimes, and they are unpredictable and intense. But the DAS removes ONE stressor from the experience, and we are grateful for that.
It's weird that you think everyone with a disability should be walking around sad and miserable all the time, or that all autistic people should look or act "autistic." Newsflash: disabled people are not all the same.