I guess some people just have a more refined taste when it comes to their “individual impression” beyond whether they can remember a piece of music they heard two years later.
You guess wrong. If something makes an impression on you, then you will remember it. If not, you will most likely forget it. That is just how human brain work.
Well, believe it or not there is a difference between remembering something and finding it memorable. You can watch a film and think “hey, this music is really good and works really well as a whole and as a part of this film” and remember that impression years later. Whether that means you can remember what the melodies are is something different.