Just a small add-on on your post, E-Ticket rides are only used within Disney Parks, related to admission for rides. This has to do with the fact that historically Disneyland Anaheim use to be free to enter and guests had to purchase an A,B,C,D,E Ticket to be able to go on rides within the park.
The ticket system is replaced in 1982 with one ticket for the entire park. All new Disney rides get labelled in the theme park community with one of the above mentioned ticket types based on the ride size and capacity. Basically keeping a old tradition alive.