I think the key is being flexible. On our first day in HS, I wanted to go to Rise, of course, but it was delayed (which happens a lot, it seems, and I am sure due to technical reasons). I don´t know, what the hundreds of other people there did, but we immediately went to the next attraction, Smugglers Run, and it was empty. I mean totally empty, so we did that 2 times in a row as pilots (crew of 2). And then we went to Mickeys Railway 2 minutes before official opening of the park and had no wait at all. And went on Rise in the evening.
All the other early entries went as planned, but IF seven dwarves would have been down, I would just taken another ride closeby with low waiting time. Probably not Peter Pan, since most people would go there. Just think what most people would do (i.e. what would be YOUR first impulse), and do the opposite.
What I want to say is, there is always a way to profit from early entry IMO.