It was indeed a very good day to head over to Six Flags Great Adventure! I got on The Joker six times and I waited between 5-10 minutes each time. Like others have said, I wouldn't wait more then 30 minutes for it.
The parking lot was mostly empty the whole day, honestly don't know how that could be.
From what I heard, lines were ranging between 20-40 minutes for most of the day.
I have just heard that the Chance Carousel will also not be returning for the 2016 season. Does Dorney realize that your actually supposed to add rides?