I don't have a *whole* lot of books, maybe two or three dozen. That's not counting Kindle, which is how I get all books now.
I would like a Kindle, but there's just something about holding a book, flipping through it's pages, the scent of the bindings in new books and aged paper in old ones, there's a whole experience there that I would be loathe to give up.
I was worried about this too, but after getting a Kindle for my birthday several months ago I have changed my mind. Although I will never get rid of my real books and still read them, there is also a special feeling related to reading on my Kindle. I never realized how awkward holding a book open can be, especially if you are reading in bed. I feel most comfortable laying on my side, something that doesn't work out too well when reading because you have to reposition the book with each page.
I enjoy the experience of reading with my Kindle because I can nestle into my covers and get cozy. My thumb or hand don't get sore and I am able to get more comfortable, which improves the experience. Plus you get used to associating reading with your cute little Kindle with its nice clean format and pretty letters and you get a good feeling inside when you pick it up.