I defo had issues with the single rider queue at SAW, I didn't have to wait in the enterance corridor, but instead was waiting on the stairs and in the station for a good 45 mins before I got on the ride. Considering single rider was meant to reduce queue times having queued for 45 mins when the advertised queue for the regular queue was 20 mins I was very dissapointed. I don't really know how the single rider system works, but the person operating the queue only let a single rider through when a group of 3 from the main queue went onto the ride, causing a huge backlog in the single rider queue, instead of occasionally letting 2 from the single rider queue through when a group of 2 went from the main queue to try and reduce the number of people in the single rider (but then maybe that not how single rider works, I've never used one before)