I find that as I'm gaining chops, I am listening much more closely to the tunes I listen to for enjoyment. I now listen for where things are in a mix,not only side to side but front to back. Coming of age in the sixties, I like the vocals to be out front and understood. Lyrics were much more important to us. They not only had to have a groove, they had to SAY something.
I did like some of the old stereo effects they used to use, like Foghat's rendition of I Just Want To Make Love To You. My favorite rock intro......gets me ready to boogie.
On another note, I'm on The Gear Page with a TON of guitarists. It's the old PRS forum...One of their favorite expressions is "cutting Through the mix", and some of us have gone hoarse trying to explain, once you CUT THROUGH(they usually mean volume wise), it is no longer a mix. Sonic space escapes most of them.