DH was denied at
Disneyland, but was provided with this as well when we went. Between wheelchair return times and these, it worked for us, not sure it would work as well at Disney World, but that's another story.
As for restrictions, the only attraction it didn't work on at the Disneyland Resort was Tiana's and you could use it on attractions that don't have
Lightning Lane as well, so if a queue is accessible, but doesn't have Lightning Lane, you could use it there. You could also use it at an attraction that the queue is not accessible and has no lightning lane, but at that point it makes more sense to get what there are now calling location return times (new name? for wheelchair return times)