most ridden and favorite: Space Mountain! When I was a teenager, we went in the off season and I made my aunt get on and off about 10 times in a row. I could've kept going but she complained, "ok, I can't see straight, we have to stop".
least ridden: toss up between Casey Jr. and Storybook boats.. they have their charm, but I usually would rather go on something else.
I always go on Jungle Cruise at least twice a day to hear the different spiels (now for research) and Pirates.
I have never gone on the AstroOrbitors (Rocket Jets still in my mind) as I don't like getting dizzy. Now, I have gone on Dumbo and they are probably identical, but I just have it in my mind I won't go on them.
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Out of all the E-tickets, the ride most ridden would probably be Pirates. We love it, the lines are usually shorter/faster, and the entire family can ride together. Least ridden (for me) would be Indy or Star Tours. There have been trips where I maybe only went once, or not at all.