A friend of ours is a narrator, or I probably never would have picked up an audiobook. And unlike a number of posters, I find I generally can't listen to books I've read in print (with a few exceptions). I just get very easily distracted with audio as compared to print, so a new-to-me book forces me to actually pay attention! I had the same problem in school--learning from lectures was not my strong suit, and I tended to read in class instead.
All my audiobooks are through Audible; the apps make it SO easy to download and listen on the iPhone or iPad. I typically listen when on the treadmill, doing dishes, folding laundry, or other tasks that don't require a whole lot of thought. My husband's done a lot of listening on his commute. He doesn't have my distraction issue though.
I still read way more than I listen. I've got a 30+ book backlog on Audible, and that'll take me forever to get through at this rate, and I finally used up my remaining credits so I could cancel last month. Even so, when I found I couldn't settle on a book on the Paperwhite today, it was nice to be able to lose myself in an audiobook instead.