I'd already been listening to MP3s for a while when I got a CD burner circa 2002, and while I copied a couple of discs, but never really listened to them. I think it was more the residual appeal of something I'd have lusted after a decade earlier- the ability to copy and make my own CDs- but was already irrelevant.
My car stereo can play MP3s off of a data CD, but I haven't done that in a while because the player is being picky about them and doesn't play half of them. These days I use a USB stick, holds a lot more than a 700MB CD. Would like it if there were a car stereo that could use DVD data disks (but not a video player, don't want to pay for a function I'll never use); the problem with the USB vs DVD is the optical disks can be bought cheap by the spindle, and you could create music sub-sets (and you can write on them what they are, not so easy with a USB stick).