I have a close friend whose daughter has problems with sensory issues. She asked me if I thought WDW would be okay for her sensory-wise. I just told her about the constant stimulation by noise, people, sights, etc. I said it was a sensory overload for us sometimes as adults. We had to go to the resort and get some down time. Her daughter can't stand someone talking to her and doesn't want to be noticed or bothered.
She can't take loud noises or crowds. So, sadly, her Mom decided that she definitely could not go to a place like disney with her. It is different for everyone of course, but in this case I think the decision was correct. She would have been miserable and so would her Mom.