Does loudness play a part in your appreciation?

For me, the perception that the volume could be recreating near the original volume makes listening real. I realistically also listen to most music at that 70 to 75 db range, but I have pulled the meter out to occasionally find myself in the low to mid 80s. So it depends on the music.

For the most part,I enjoy the music I'm listening to regardless of volume level.HOWEVER,there are many times when a song triggers associated memories..Most all the time,those songs are of the variety that are high energy & I'll turn that volume knob clockwise which does seem to add to the enjoyment factor...

It's a great question actually. I've wondered about this myself some lately.  

A friend and I were comparing listening sessions recently and I realized we like to listen at different volume levels. And, thoughts around how each of our systems will sound different if he's listening at 80db and I'm listening at 70db most of the time.  

My system's character changes overall when comparing 65,70,75,80-85db listening levels. I don't care for how my current system sounds when the volume level is turned up really loud. My level of interest and engagement drops notably.

With or without my hearing aids?

As others have indicated, 70-75 db at my listening position is a good range to comfortably enjoy the hi-fidelity of my system without stress. Above 80 db starts to get uncomfortable.