Hmm, I recall in the past of people saying that they would convert the Virtual Queue to Stand-By after a period of time (most likely in the latter half of operations), but that if they are pressed into a larger capacity; could change up on a quicker notice.
I am probably wrong on that, but I thought that was how they did it for a period of time. Out of curiosity, could it of been because you were there during a holiday weekend?