I didn't see one last week. If they do have one, it's probably just the same situation as the FastPass. The way the queue is designed, just doesn't allow entry into the queue except through the exit (handicapped only) and at the very beginning.
The way they have it setup for FP, you actually walk through 2/3's of the queue before you catch up to the line. The two times I've used the FastPass, my wait time was about 25-30 minutes and there was rarely more than 50-75 people held back in the stand-by line.