Rope dropping Slinky Dog in April with my wife for our anniversary was one of the most fun experiences I've had at Disney.
Park opened at 8:00 for extra magic hours. We arrived at 7:00. These were all of the people here at that time:
View attachment 397895
By 7:20, they'd let guests inside, and we were at the front where they stop you about halfway down the street:
View attachment 397897
I didn't know what to expect from here. I don't know why I thought it was going to be a mad dash of people running to Toy Story Land, but was pleasantly surprised when this happed at 7:35:
By 7:45, we're walking into Toy Story Land. How cool:
We were on the ride at 8:02:
View attachment 397907
So we waited a total of 1 hour to ride the ride, but it was a lot more fun of an experience doing it this way, than just waiting in line for an hour at some random time of the day.
Hope this helps. Have fun!!
BTW, on each video, I turn the camera around to see the crowd
(EDIT: click on the Imgur video to open it in Imgur, then enable sound)