Hiya -
we were there last April and yes, they checked the passes -some rides used a scanner, some used a permanent marker to mark the box on the back.
It was worth it for us, but if you wanted to do repeated rides on one favourite, either get there early or try and book on-site when there is a good room rate - l know some folks who just book the room - cheapest one possible of course.... has to be enough for every member of the party , check in REALLY EARLY at the desk and don't bother using the room - just for the 2 days unlimited FOTL access.
Tessa