Oh I have a couple.
Zyklon Loop, Blizzard, Wacky Worm, and Dragon Express @ Star City (2005) - Star City is the second park close to me that has "large" roller coasters. I was a kid and I was still not into roller coasters when we went there in 2005. For whatever reason, I still haven't been there since, even if there have been a lot of new additions and changes to the park over the past 10 years.
Space Mountain @ Hong Kong Disneyland (2008) - Though I was already into roller coasters at the time, I was afraid of the advertised temporary Halloween retheme to Space Mountain Ghost Galaxy. I was really afraid of Halloween stuff back then.
Rolling X-Train and Eagle Fortress @ Everland (2012) - Rolling X-Train because we had limited time and decided to ride T Express instead. Eagle Fortress because it was SBNO. (And now it's being dismantled; RIP Eagle Fortress. I'm really hoping you'll be getting a comparably awesome successor.)
Comet Express @ Lotte World (2014) - My schoolmates (and other Korean friends we made) who were with me decided to not ride it given our limited time in the park.
Hollywood Dream The Ride, Flight of the Hippogriff, and Snoopy's Great Race @ Universal Studios Japan (2015) - We wasted so much of our time at the Harry Potter section of the park (and we weren't even able to ride Forbidden Journey!!!!
) that by the time we finally went to the entrance of Hollywood Dream the queue was already too long and we had too little time left. I crey evrytim. We didn't ride Hippogriff or Snoopy because my family wasn't too interested.
Flounder's Flying Fish Coaster @ Tokyo DisneySea (2015) - Queues were really long virtually everywhere and we decided to ride on the more famous and must-see attractions instead.