What a great discussion! Especially agree with the "smiles on faces" comments!
Being a theme park/roller coaster nut all my life, I was pretty limited here in Chicago. Six Flags Great America sucks and always has, it's overpriced, graffitti-laden, packed with punks and the rides aren't that great. So back in the early 80's I started spreading my wings and flew to St. Louis to check out that Six Flags, and a couple other places I don't even remember. They did nothing for me. One day in '85 a co-worker gave me a Kings Island brochure, she had been in Cincinnati with her boyfriend for something and they had stopped in. So I went the next possible weekend and absolutely fell in love, and The Vortex wasn't even built yet! It was so different, so spacious, so laid-back, THE WORKERS WERE ALL POLITE, AND EVEN PLEASANT, less expensive and so much more to do, it was literally like being in another world - and THAT is what a vacation is supposed to be.
Since then I have visited at least once a year, through the years I have brought several different boyfriends, my first husband, my current husband, several friends, and now two kids of my own; it doesn't matter who you bring, everybody ends up happy. Now that my daughters are big enough to get on everything (I spent several years reluctantly stuck mainly in Hanna-Barbera Land) we spend at least two weeks and two weekends and come back for Fear Fest. There is nowhere else I can take my daughters and feel so free and so safe. I have never had an unpleasant experience of any kind at Kings Island. We love all the rides (although The Beast alone was what hooked me in the first place and will always be the best!), the food is great, and yes we even watch the shows sometimes. We love it so much we were crazy enough to make the trek in two days to take part in the Tomb Raider video shoot in November. It's that kind of thing, you are treated like an actual person and not just a wallet. NEVER got that feeling from Six Flags - and they don't have a water park either.
Just my two cents!