We were there on Monday the 25th of November & the ride was down for most of the day, when it was up it was posting a 3 hour wait.
We had given up hope of riding it as we were only there for two days & had decided that standing in line for hours for one ride was not the best use of our time.
We had jumped between the two parks during the day & ended up going back to IOA to see the Christmas Projection show on Hogwarts, when it was over we decided to try & ride FJ again using our EP's & we ended up walking straight onto the ride.
As we were walking through Hogsmeade, we saw a lot of people crowding round Hagrids which was strange as by that time it was after 8pm & the park was technically closed, however we along with everyone else could hear the ride was running so we hung around & after 5 minutes a huge cheer went up from the front of the crowd & we realised that they had opened the ride.
We along with everyone else who was there, pretty much walked onto the ride, the only time we were stopped was just before boarding.
By the time we got off, they had closed the line.
I'm not saying that they do this every night but it might be worth checking it out at the end of night, particularly if the ride has been down a lot that day.