I'm about 6'4", 240lbs and it's easy to make myself seem like a much larger person. I just scoot forward when loading and I can get some space between myself and the lap bar. My butt wasn't in the seat at all during my 2 rides today.
I am so glad I found this thread before my trip tomorrow. I hope it doesn't rain. I visited KI as a kid back in the 80s and my last visit was the season Son of Beast opened. The line jumping situation sounds atrocious.