My nephew and I did TT twice last week - once with FP+ and once Single Rider.
FP+, including the 5 minute design process took more than 20 minutes, and we actually rode later than the folks who entered the Stand-by line at the same time as us. I know this, as there was a particularly tall gentleman wearing a Hummer t-shirt (hubby has the same one from TT four years ago) entering Stand-by at the same time we entered the FP+ line. When we entered the post-ride area, he was already sitting in one of the show cars having his photo taken.
Next time around, we took the Single Rider option, walked through the empty queue, and were seated immediately! In and out in less than 10.
On another note, Test Track was still closed when we were there last year, so this was our first time since the refurb. Big - giant - meh!! I know the kids like the Sim-car design, but even my 11 year old nephew felt the design process was a one and done! Oh look at the pretty tree-shaped lights .... That's it?
And now you can't even buy the yellow Hummer t-shirts anymore, as Hummer is not a Chevrolet product. Son #1 swiped hubby's tee, and he really wanted a new one.