I was there at rope drop too and we were routed through a very short path to get to the ride and did not traverse the full queue path. I'm sure once the short path to the ride start is full, they cut off the short cut and lead the rest of the line through the full queue, but right at first, that doesn't happen. Having gotten through the short path, I cannot say at what point the short cut is closed and full path begins but I would imagine it was pretty quick.