Last year was the first one for me. The cold and rain could have made it a crappy day, but it wasn't happening. I brought along some friends who had never been to the park and a couple of them had never been on a coaster. That's what made it so memorable for me, seeing their nervousness before the ride, and the excitement after.
The crowds weren't too bad but we decided to get Fast Lane passes anyway. Jumping to the front of the line was awesome and made the experience all the better. It's crazy, I did it, and I still can't fathom the idea of doing it.
Looking forward to making the most of Opening Day 2013. It cannot get here fast enough.