When I was there last week they didn't have it for rope drop obviously, since we were flying through the queue. But when we went in the afternoon and it was a 75 min wait, they were using it.
When they use it, you stand still for a long time outside. Then they pack that room (the preshow is great). So if outside, you stand still for a long time, and then move a ton until the preshow is filled. However, once you get past the pre-show, you move continuously.