The vast majority of my listening is in what you refer to as "proper audiophilism", but that has as much to do with the types of music I listen to, as much as wanting to hear it from the best position.
Pretty much the types of music I listen to, revolve around music that is decidedly NOT conducive to multitasking. To get the most out of, It requires concentration, and sometimes, even a bit of work.
I listen to music* that tends to be complex, offers a broad range of emotional content, has a very high level of musicianship, changes: tempo, dynamics, rhythm, time signatures, chord progressions, over an extended period of time.
And much of what occurs later in the music, is specifically based on what occurred earlier.
So, if I was multitasking, I would most likely miss subtleties, and not so subtleties, in the complete piece of music. If there is some musical resolution, and I missed the portion of music that is being resolved, it would come off as emotionally flat, for example.
So yeah, I make an effort to have a specific time period to sit down, and do nothing but actively listen. It is always worth the effort.
*progressive and avant-garde forms of jazz, contemporary, and older forms. Fusion, avant-garde, post bop, chamber jazz.
*contemporary, avant-garde classical music. Usually pretty thorny sounding stuff.
*classic and contemporary prog, avant-prog, Zeuhl, Canterbury, prog-metal.
