I think it's very important to emphasize that your instructions are just suggestions. Everyone should be encouraged to listen to their own bodies and modify as necessary if something is too hard, uncomfortable, painful, etc.
My pet peeve with instructors are those who are just there to get their own workout. I've had a couple of "racer" instructors who basically taught classes so that they could kill two birds with one stone. So there they would be pushing these insanely high watts (this gym had spin bikes with power meters) while the rest of us would be hanging over the side of our bikes ready to throw up. I had another instructor (who ended up becoming a friend and riding buddy) who could spin like nobody's business. No matter the resistance, he could maintain a 90+ cadence. I did a couple of weeklong tours with him in Tennessee and he was a mountain goat. It took a lot to convince him that the rest of us mere mortals couldn't do that and until I did, his spin class was kind of a PITA.
You don't sound like the type that would do that, but it's important to keep in mind that just because you find a particular level of difficulty easy; the rest of the class might not. Pay attention to how people are responding to your instructors. If you see people struggling en masse, dial it down a notch.
Good luck. I like spin classes a lot. With the right music and the right instruction, they can really be a blast.
Live with intention. Walk to the edge. Listen hard. Practice wellness. Play with abandon. Laugh. Choose with no regret. Continue to learn. Appreciate your friends. Do what you love. Live as if this is all there is.
--Mary Anne Radmacher