I was not focused on rides during JN, instead on aspects only available at JN. However, I did notice a 5min wait time at the end of the night for Falcon and Rise of the Resistance (RotR). RotR can go down, so if that ride is really important to you perhaps consider hitting that one earlier.
I was at Batuu from 5:40pm- 7:40pm. At 6pm-ish the crowd (on 11/15) was medium-light. There were definitely families there, but it wasn't congested. At 7pm it did get noticeably lighter as non-JN night families were leaving and JN nights people were coming over to queue.
It would be useful to get your JN band internally, if you can. That way you can get it earlier and focus on getting the most of rides instead of being held at the gate until 5:30pm opening.