I've been on 105 coasters, slightly less than people here. I'm currently working up to hit major parks around the country (and eventually, world) but with my shaky job situation that hit a snag. Next year I hope to come around to Carowinds, for instance. I have also yet to ride SV at Cedar Point, as I was last there in 2017. For that reason my list is going to seem a little "basic" I guess the slang would be, but whatever, as of Sept 2018 these are my favorite coasters, in no particular order:
-Millennium Force: like Joe said, it's pure exhilaration and shockingly smooth after 18 years. Everytime I rode it I had a giant smile on my face.
-Maverick: those turns, and that launch. Everything about this ride is proof that nothing needs to be tall to be a great.
-Mystic Timbers: a GCI masterpiece. The shed is like a neat little topper on the end, it's all about that relentless airtime and consistent speed thru the woods.
-White Lightning: yes, at Fun Spot. This one is just pure fun, Mystic Timbers on a smaller scale. I loved riding that thing over and over.
-Mako: yeah, it's not the tallest B&M hypercoaster, but boy does it perfect the hell out of the standard out-and-back layout with such a tremendous speedy ending full of great banked turns. This one is what makes me desire so much to go to Carowinds to ride Fury.
-Manta: this is the Mack launch at SeaWorld San Diego. Two launches, pure speed and heavenly curves despite its "family coaster" moniker. (because if it's not over 200 ft and has no inversions...) Such a great ride.
-Twisted Colossus: the only coaster I really adore at SFMM, this is just a great RMC that's hampered by that second lift hill. Yet the dueling elements really make up for it.
-Space Mountain: at Disneyland. Yes. I put this on here. It makes me happy, it's stunningly simple yet the effect is pure fun. It's a zen ride everytime. I love it.
-Cannibal: at Lagoon, probably the craziest ride I've ever ridden, that I've enjoyed (glares at X2), the "Lagoon roll" maneuver is strikingly unsettling yet glorious and that drop is stuff of legends.
-Xcelerator: at Knott's... it's that launch. Yeah, Top Thrill Dragster has a great launch but Xcelerator is so intense. Can not wait to ride it again in a couple weeks.
Really hoping this list gets more and more defined as the years go on.