We used our Fast Lane passes today. We rode Diamondback four times, Stunt Coaster, Firehawk, Flight of Fear, Boo Blaster, WindSeeker twice, and Log Flume. I estimate we saved over 5 hours of line time. Totally worth it IMO.
Editted to add that we rode the front seats of everything as well.
Tanna, you look for the big Fast Lane placard to find the entrance. It looks like it could just be an advertising sign but it is the entrance demarcation. We were a bit confused at first.