I'm autistic and struggle with queues. I have never had one of these passes and when I went to theme parks as a teenager I went on the quietest day/time I could find and avoided the very popular rides with long queues. The differences between a ride and a queue:
-- you don't know how long the queue will last. If time estimates are given, they might be wrong, which can be hard if you've been mentally telling yourself you only have to endure it for x minutes when in fact it's x+y minutes.
-- the people around you might be very loud, and that would be your main sensory input (making it different from a ride where people around you might scream but there's also the noise and sensations of the ride - I find multiple loud conversations much harder to deal with than other types of noise)
-- the people around you might bump or jostle you, it's unpredictable. Unexpected physical contact plus loud noise sends my body into an acute 'fight or flight' stress response even if mentally I know nothing dangerous is happening
-- once you are in the queue, you are 'trapped' and can't leave to escape the people around you, take a break, use the bathroom etc. Yes, you can't leave the ride once you're on it either, but the ride is far, far shorter. With some rides this is a mental stressor (you'll lose your place in the queue if you leave, annoy the people you're with, etc) but in others the queue system can make it physically difficult to just walk away
-- depending on the time of year it can be very hot or cold and you might be sensitive to that. I have no problems with cold but will faint if I have to stand for a long time on a hot day
-- all of these things can be much worse if you're a child, so you can't just walk away if you need to, or if you have trouble verbally communicating your needs
Obviously nobody, autistic or not, enjoys the above things, but there's a difference between disliking something but putting up with it, and it causing such distress that you can't do the thing in question.
I don't actually have a strong opinion on the passes either way and wouldn't use one myself. This is just a post for the people who struggle to empathise and understand how someone could have severe anxiety in a queue yet enjoy a ride. Assuming of course that those posts are genuine and not just attempts to be nasty about those who find it difficult.