I was there the same day! It was my first visit to Cedar Point! We flew all the way from Colorado and spent 2 days in the park, (aug 1st & 2nd 2013). Since we live so far away we decided to get the Fast Lane Plus, it was a blast, defiantly worth the Money. I think the 1st day was by far the best. But the rain we got that afternoon was ridiculous, we were in line for Mantis when it hit; which by the way, was not as horrible as I expected.
I know what you mean by Gatekeeper being rough in the back. But I thought it was a lot better in the back too! The front on that ride is pretty tame.
Hopefully I'll get back to the point in the next year or two; that was my dream vacation. Now that I'm back home I really miss Cedar Point. I would give anything to just be standing in line for Millennium right now. It's such a wonderful beautiful place! It's every coaster enthusiasts dream. I meant think about it, an island (technically peninsula) filled with incredible roller coasters! It's the perfect park in my opinion! The only thin it's missing is a flying coaster and a 4th dimension coaster!
Well I'm done with my rant, I hope you had as good of a visit as I did!
-Joe