Disney DOES clarify their policy. As with any policy, it's necessary for there to be exceptions. Walt Disney World (ditto for
Disneyland) isn't going to advertise an attraction by attraction list*.
It's NOT front of the line access. It's convenience access for Walt Disney World/Disneyland.
Disney treats all Guests as equally as possible. When a Guest is directed to an alternate entrance (not 'pulled from the line') it's because they can't fit or maneuver through the mainstream queue
due to ITS design. Period.
A great example is Living with the Land. When there's a long line for that, a Cast Member will hand out written Fast Passes to Guests in
ecvs, to come back at a time about equal to what the wait would be. When they return, they're directed through the former FastPass lane - a pretty straight shot (two ninety degree turns) to the loading platform. Why? Well, it's too hard (dangerous for some) to snake around all the turns in the mainstream queue. So this may LOOK like FOTL access - but no. It's somebody waiting 45 minutes
like everyone else, just some
where else.
Ah, so it's not enough to be disabled and need to be in, or at least need to tour theme parks in, a wheelchair or
ECV; but disabled Guests also need to deal with nastiness from other Guests over what those Guests
percieve as preferred access - and that's fair
HOW?

While I, and probably others, still disagree over this so-called 'preferred' treatment - don't you think the one MORE than balances the other?
*They do
publish such a list, by the way - it's the Guide for Guests with Disabilities, and it indicates,
for the most part, how such Guests board each attraction. There are even exceptions to these, which some of us have tried explaining several times, based on personal experience.