Arriving early has nothing to do with the disability. anyone who wants to have their choice of prime seating will have an easier time the earlier they show up.
ASL interpretation is on a set schedule, so if you're utilizing that service, you will be limited to certain days and performance times.
No one is forcing anything, but yes, people can be very different and different situations can have very different solutions. The point of the GAC is to provide appropriate assistance, not to give priority.
As Lisa said, at attractions that offer reflective captioning (indicated by an "RC" on the guidemap) all you have to do is ask a cast member upon entering that attraction. Guest Relations offers handheld captioning devices as well as video closed captioning remote controls, Assisted Listening Devices, and ASL interpretation schedules for guests who are deaf or hard of hearing.