I have...um, well, it was...okay, uh....I'm a slide film virgin
Never really gave it much thought. I got my K1000 straight out of college and knew nothing - just shot with film I could find in the stores and made sure the light meter needle was in the middle. I did buy a book to learn about Photography (with a capital P) but never really made it all the way through. I found myself working hard on composition but not thinking as much about metering or film stock. Then I was off gallivanting: to grad school, to teaching overseas, back to the States to figure out if I was cut out for living in my own country...the K1000 came with me through it all, but mostly just for pictures, not Photography.
By the time I finally settled in to be more serious, film was harder to find, developing labs were getting harder to find, and I was...well, er, still am...poor, so the time and cost involved in E6 developing was daunting. I stuck to color negative film that I could get developed at my local lab and b&w that I could develop myself.
Color developing at home is more trouble than it's worth at the moment, especially since the lab I go to is not expensive, but they don't cross process so I can't even shoot slide for cross-processing without sending it out somewhere.
I do have one roll of Kodachrome 64 in my fridge. It came in the bag that my brother-in-law handed to me one day containing his entire Spotmatic kit (including half a roll of Tri-X still in the camera.) I am going to shoot that one day to process it in Caffenol. And one day when it makes sense to start developing color at home, maybe I'll finally get around to grabbing an E6 kit and shooting some slide film. I do think it's quite beautiful in ways that color negative film isn't, but at the moment, it's just not a practical thing for me to use.