I'm basing this generalization on my experience with my students (most of whom are jazz majors, so I expect them to be more of the "hard core obsessives" of which you speak). They bring in a recording they've been checking out and I'll ask them who's on bass, drums etc. If they don't know I have them look it up. I think it's important for them to study the details of the music and be able to tell the difference between, say, Elvin Jones/Tony Williams/Billy Higgins/Art Blakey, etc.
As far as listening to an entire record, that's how I discovered many tunes I might not have otherwise. I originally purchased Speak No Evil for the title cut, but then discovered Wildflower and Infant Eyes, which have become favorite tunes from the record.
Yes, the shrinking attention span has become quite an issue, especially as it applies in the area of learning to play, which is a process where improvement is gradual and requires long hours of "shedding". No shortcuts there.