I agree that you have to SPIN, 90 rpm or a bit more if you can get comfy doing it. It's weird at first, but it's necessary.

However, I find that advice very hard to follow on club rides, where my average cadence rarely goes over 75-80 rpm (whereas it would be closer to 88 on a solo ride). I find that I am not comfortable riding at a high cadence in a pack, especially if there is someone I don't know/trust in front of me. Others feel the same??