We don't leave for our trip until this coming Thursday. I did recently inquire about getting one at DL since we're locals, and that was not the greatest experience. It nearly caused a meltdown. The woman was not very receptive to me (I think because I present so "normal") and tried to tell me it probably wouldn't help me since I still had to wait for rides and I would have to wait in some fastpass lines still. She tried really hard to not only discourage me from getting the
DAS, but also to discourage me from being in the parks at all that weekend since it was a busy weekend. I'm not quite sure why she took that approach when I clearly outlined to her that it is only once a line gets over 20-30 minutes in length that it becomes a problem. I'm capable of more or less coping up until that point approximately (unless there are incessant screaming children or people touching me in line and then I have to immediately leave), but any more than that and a standard queue doesn't work for me. I need somewhere else I can wait and have a little more control over my environment.
The whole experience was just so stressful and not easy and overwhelming, my wife ended up getting me a churro and we left because I was at my limit (the churro was a reward I had established for myself for trying to do this so I knew I had something good to look forward to if the process didn't go well and that did help a bit so I do recommend having something to look forward to if it not going well will upset you). When we go to WDW, I'm definitely bringing my Duffy bear to help soothe me through this process and I might just have my wife speak for me because I cannot deal with a CM acting like that again.