I use auto dock/undock on cargo/passenger/large ships as a safety precaution, while smaller ones don't really need it. Supercruise assist, however, is a godsend for me. I'm so glad they put a slot for it on every ship. I used to start falling asleep during supercruise from the relaxing music and doing very little, speeding past my target, but now I can just set it and do some other activity with minimal attention on navigation, using the autopilot like any transit airplane has today. I only have to watch for interdictions and avoid bodies my target might be tucked behind, but everything else is taken care of. It definitely makes trading and passenger runs more efficient for me.