Why don't you want to do superspins? I find that used in interval training you'll learn high cadence and a smooth pedalling motion. Getting your cadence up over 120 or btter will reveal jerky pedalling pretty quickly. What is it you object to? Just curious.
Coming back from an extremely frustrating class - the woman had mostly cadences of like 150, and I do not go there to chafe off my anatomy.
Not a single one could keep up her cadence so it was really stupid. Even she was basically bouncing off her saddle !?!

And besides the occasional "up", "forward" "back down" "harder" "3 minutes of cool-down" she said almost nothing.

We were guessing that she is getting paid for her private training sessions.