Well that just doesn't seem to be the case. It looks like average wait times are 1-2hrs (probably why they close the line at 4:00 for a 5:00 shutdown).
So, if you get there at 9ish when the gates open, you'll be done by 11:00 at the latest. Still plenty of time to hit rides that tend to have 30 minute waits this time of the year.