I hear ya. When one obsesses about vacation planning like I do and change things on a whim....waiting for that call back in torture

Kerri
I actually have to give Costco some props here:
I checked Disney's site first thing this morning, the room # I wanted was available. I called Costco travel when they opened, they got on the phone with Disney ... room number not available. Since I'd seen it pop in and out a few times already, I didn't give up all hope, and they mentioned that just by clicking it (without booking) on the Disney site I might have put a temporary hold on the room. We waited a bit to see if it would pop back up, but it didn't, and I had to leave to drive to work. I figured at that point that I would just book the room the next time I saw it come up (if it ever did) and then let Costco sort out the mess once I had a confirmation # for the target room.
...but, five minutes later, the TA from Costco called me back to say she'd stayed on the line with Disney even after I'd regretfully told her I had to leave for work, and that the room I wanted DID show up just a few minutes later. Within two minutes (part of which I was driving and talking on bluetooth), the Costco rep had me upgraded and my deposit balance applied, and by the time I walked up to my office from the parking lot, the email with the new room number was in my inbox.
Lessons learned:
--If you get the right TA, seems they really will go the extra mile
--Perhaps don't transfer your booking to a TA until you're positive you know what room you want. (I thought I was positive, to be fair.) If you get itchy about another room, either do not call your TA immediately after you've been poking around on the Disney site, OR if you see the room you want and your initial booking is still cancellable, just reserve it now, let your TA sort it out. (The former option is probably better.)
--Rooms go in and out of availability on the system a lot.
Also: I was told that the new room (Concierge) had a non-refundable deposit (which I knew), but if I needed to downgrade later they would apply the deposit to the new booking. I guess the Disney rep told the Costco rep this. (Maybe this is already a known thing, but thought I would share it anyway.)
Since I'm now up to a savings of about $230 (in the form of a Costco cash card, which we will definitely use), so far the TA experience has been worth the ~10 minutes or so I've spent on the phone, and the one form I had to fill out and send to Costco to transfer it in the first place. Most of the stress has been of my own doing.
And: I now have a cat 00V with a bump-out verandah near the concierge lounge. WHAT HAVE I DONE?