Autism affects sufferers in different ways. Some will be very shy, others will be highly madly obsessed with strange things whilst others be unstabaliaee by simple things like noises, movements or even certain buzz words.
As a sufferer of this (but at a higher functioning level (aspergers)) I have seen kids break down in tears or become enraged just by certain words and sounds, whether that be saying their favourite fictional character is dead or noisy machinery.
Whilst I have never used exit rider due to being in the generation before and getting used to the queue way, there's a lot of sufferers who just can't accept and deal with the change and surge of information. And it is here why they need to use exit rider.