I'll throw down on the No Paper Books pile, since we're clearly under-represented here.
Husband and I are planning a move in the next year or so and we've got 6 bookcases CRAMMED full of books. And that's been pared down over the years quite a bit and we're still looking at boxes and boxes to move. Ugh. I'm converting as fast as possible to get the paper OUT of the house so that we don't have to lug it around to the new location.
The more I get into my eReader, the more I can't understand how I survived without it. You can carry your whole library everywhere for a pound of eReader technology. You can highlight, search, take pictures, and quote with the push of a few buttons. You can hold the book with one hand without straining your poor fingers. You never need to lose your place because your cat stole your bookmark. It's a miracle.
I have a bad back and it's getting worse. Just getting the books from the bottom shelves is impossible some days. But I never have trouble getting a book off my eReader. I WUV IT SO!!
Husband still likes to go browse at Half Price and I go for the fun and write down titles. I'd rather buy an eBook at new prices than get a paperback at used prices. But I get that I'm a Special Butterfly.