I only rode Vortex once, back in 88 when it was in it's second year of operation. I waited 3 and a half hours to ride, much to the chagrin of my family who were anxious to make the long drive back to Detroit. It was maybe a little herky jerky in those young days, but definitely not rough. (King Cobra on the other hand...) Vortex was a blast, and the first coaster I ever rode solo as nobody else in my family was willing to endure that massive line that stretched way down the midway.
I tried to get my dad to postpone the drive back home for a night ride on The Beast, as in those pre-internet days it was only after I got off a day ride and was talking about it when a more seasoned KI-goer said "oh, that's nothing! You gotta ride it at night! " Pops wasn't having it though.
I still haven't been back to KI but would like to head down to sample Orion, Diamondback, Mystic Timbers, Banshee, etc
Given what I've heard about latter day Vortex it's no loss. I don't mind smaller Arrow loopers. I've ridden the Corkscrews are CP and VF in the past 3 years. I find em clunky but not painful. Both those were a one and done for me. But something the size of Vortex with sharper transitions, I can only imagine. It seems like it had a pretty good run, really. Look how long it outlasted Shockwave at SFGA.