The ride from my childhood that I really remember scaring the liver out of me was Snow White. I swear it was scarier in the 80s, before it was dubbed “scary adventure”.
A few years later, the Alien scene on great movie ride scared me, but it wasn’t really the pop out alien itself, it was the whole thing, the blaring alarm in the background, the ooze I couldn’t identify, the SWEATY Sigourney Weaver animatronic that looked like she was terrified, the whole atmosphere was tense. So many great details I’d appreciate LATER, but as a kid back then, yeesh that was the stuff of nightmares.