About letting FP just go..
They have to be careful. A week or so ago, I had a FP some random lady gave me as I entered Epcot. (Thank you nice random lady!) They were otherwise out of FP's.
We got in line, in the FP line, and we got 5 feet in the door before being stopped as the FP line stretched that far. Standby was just reaching the doorway, and single rider was to the door as well. This means, every single line in the Test Track building was to the doors, full of people.
FP did keep moving at a reasonable pace. I was on the ride within 15-20minutes - to be expected with a FP. They let only 10 people from the standby line go with the FP people into the preshow rooms.
Was this fair? Yes. Otherwise, FP which was reserved 4 hours prior (I checked the times on mine) would be waiting much longer, as it was they were looking at a 20min wait.
If they didn't let FP just go on through at most rides, they'd start to backup. Test Track obviously had a minor breakdown that backed them up a little. And it's not meant to be mean to the standby, but the FP people made their reservations to ride. Anyone is allowed to do it.
I do think they need to work on correct standby time. At the time you entered, it could of been 45mins or so, but then lots of people got in line. I've seen this happen often. Now that they often rely on the flik cards for wait times, it's not a CM monitoring the line and changing it constantly. Rides can fluctuate greatly within a 5-10 min period. You kinda need to judge it yourself when you enter the line - at Soarin for example, if it's anywhere before the big picture room, like the upramp or anything, it's atleast an hour.
