Do you listen with your eyes closed? Visual cues do affect the listening experience. My Quads disappear all the time, but having my eyes open can interfere with that. This was advice I got as a young guitar student going to hear Segovia. My teacher told me to spend a good part of the concert with my eyes closed; to focus on the music and not be distracted from the music by the eyes. If sound comes from the right in my system, for instance, and I see the speaker it can make “disappearing act” harder.
Agreed with other responders about some jazz and pop mixes from the 60s. Big bands with an entire sax section panned hard left, trumpets hard right. Not much you can do with that. They didn’t start mixing/panning sound stages, it seems, until the 70s.