I know we've been doing the Buzz n Woody m&g for the past 3 trips and have never seen the standby less than 45 minutes- and that's checking the park several times over the course of our vacations. Since we know the general times for other meets that are done outside near rides, we've often waited that long for others as well simply because we didn't want to have to back track to that area of the park again and then stand in a long line. I know that the wait for Gaston can be quite long, although we usually skip him due to the line and him not being at the top of the list.
My point being, A&E is far from the only m&g that has lengthy standby lines. It would seem the problem is they offer a FP+ because those with no fp+ don't seem to be a source of complaints about lines and I find that strange.