I do still read ‘proper’ books, but the reasons I love my Kindle are:
Can read in bed without needing a bedside light
Since I can easily get through a book in not much more than 24 hours when on holiday, it means I don’t have to take 5 books to last me a week. Especially important if flying with hand baggage only, which I did when I first had my Kindle.
Very long, fat, books, which I’d never read otherwise (too heavy and awkward to hold in bed) are a doddle on the Kindle. Without it I’d never have read e.g. A Suitable Boy, and a few others.
And lastly, you can adjust the font.
Now and then I pick up a real book in a shop, only to put it back because the print is on the small size.