We were there last week and I believe the wait times are probably fairly accurate. On Saturday, Oct. 14, during the late morning, the wait time posted as 240 minutes (4 hours!). Crazy, right?
However, here is the secret: If you are "in line" even one minute before closing, they will let you ride. I found this tip from a cast member, who told us that it will cut your wait time to 1/4 of the average wait, which I believe is around 2 hours. Sure enough, my wife and I got to the entrance at 8:45 and we were on the ride in about 30 minutes or less. Here's another tip, make sure you know where you are going at night. It is VERY dark and the signs are not lit. We took a couple false trails and almost didn't make it by 9:00. We were only able to find the entrance by asking people.
It is a fantastic ride and should not be missed. However, it would be very scary for young children. My wife and I got a little queasy from motion sickness, but not enough to wish we could go back and ride it again. We watched the grandkids (4 all 4 and under) while we insisted that our adult children and spouses go back at night to ride. They were glad they did.