Okay, a story from my trip this last week. We got out of the first Fantasmic Show and, with it being early, decided to stick around. Upon walking over to Tower of Terror we saw a 20 minute wait time and hopped in line. After wating forty minutes we were still not in the door, but could now see it and feel that lovely air conditioning. The stand by line had not moved in some time. A party behind us asked a passing CM, very polietly, what she guessed the our wait time would be from then on, as they were hoping to catch the second Fantasmic showing. The CM told us that the FP line was actually longer than the stand by line at this point in time so the progress of the stand by line would be little to none. She then told us that her best guess was that the wait time for us, where we were, would be about thirty minutes factoring in the FP line. Let me just say I don't think the FP is working as well as it could when the FP line ends up longer than the stand by line.
I am against using expired fastpasses. We were there for ten days and never left a fastpass unused and always returned during our time window because I feel that it is the polite thing to do for waiting guests, nor did we ever just sit around and wait for the time to come around. There was not a single time in which we used our fastpass within the first ten minutes of being able to use it either. If you know you have a dining reservation, don't get your fastpass for that time, and yes, you know about what time will be spit out when you get your fastpass.
I am all for them making the window larger, even four hours because no dining or show or parade lasts four hours, but I also think they should not allow someone with a time between ten and eleven in the morning to redeem the fastpasses at ten at night. Sorry if something happened, I know it sucks, but think about the other guests.
Now, the above Tower of Terror expirence is the worst I've had, by far, and after leaving the line to see the second Fantasmic myself I would have no believed how much longer the FP line was than the stand by line, but I have had other, similar, moments on other attractions. When the wait time you're given says twenty minutes (and, seeing the line, I would have guessed about twenty as well) and then waiting what would have been seventy due to people using expired fastpasses I think is a little extreme and should be cause to pay more attention, and a little more respect to people with differing opinions.