I ripped all my CDs to my hard drive years ago, and still occasionally buy new ones. I think I have purchased one digital track in my life. I'll load some of those onto my MP3 player for portable music, such as when doing yardwork.
At my PC, I use Pandora (free) to discover new music or hear a generally related station, and Spotify (also free) or YouTube to hear something specific that I don't already own.
In my car, Sirius satellite radio or CDs. And every once in a while I'll break out a cassette.