We did rope drop in March. We walked straight to 7DMT as we could not get FP. While the line was not too long when we got there, they had some technical difficulties. We decided to wait and it was only about 20 minutes before it opened. By then the line was almost around to Dumbo.

I would not take the train, I would walk. When you know where you are going, you can walk a bit faster than strollers and get there quicker.