My memory of 8-tracks was the kid across the street from me, for Christmas, probably 1980, got this little robot thing. It didn't really do much, it could move around but very poorly. But it did play 8-tracks. His sister had the Grease Soundtrack on 8-track and that's how we would play with this robot he got . . . by letting it play Grease for us. That's my predominant memory of 8-tracks.
The early 80s were weird.