2 hour free parking only benefited the frequent fear passes like me. I did it every week. but it was only a dozen or so cars that would be arriving at that time during ffp.
the real problem was the rush of fear days, that was like 50+ cars trying to enter at midnight. cutting each other, people driving wild.
after rush of fear ended it was very light. just a handful of cars here and there. most people were leaving the park.
what did you see last year? maybe something bad happened last year and they didn't wanna deal with it.
but I don't think anyone will arrive at midnight and pay full parking just for 2 hours of hhn. and if you are a pass holder with parking you would probably arrive earlier.