As a 5-year-old I was terrified of the Rocket Jets. They were so high off the ground it felt like I was going to fall out and to my death. As an adult I still avoid that ride, but mostly because it's just not interesting anymore. ( Something to do with being on the ground? Maybe that it's just a kiddie ride that spins in circles? If I want an experience that goes endlessly in circles I'll simply ask someone at work to find a conclusive answer to an issue. )
I never went on the old timey rides, either. The horsedrawn streetcars, old 1903 type cars, etc. Now that I've spent time refurbing a few old cars I have more respect for these old things and enjoy a ride in them now and again.