Note: I participate pretty equally in all book forms! I'm slowly reading paper books less and less, but I still enjoy them.
We've used them for hundreds of years. Their weight and feel is strong enough --and engaging enough -- to stand competition against the e-book format, simply because the loss of the analog nature would be too much to bear for many . Strangely enough, I find I have a much harder time focusing on a physical book, which is why I've moved more towards e-books over time.
E-books helped me survive concert band. I would open up a book on my music stand just next to my binder, and sit and quietly read while our director yelled at other sections.
I would read on my phone in between class. In college I used my kindle to buy textbooks, and would bookmark and highlight pages to take notes and keep track of difficult passages. I could flip between chapters in class with 2 clicks.
We got my dad a kindle, since he used to have to bring 3 or 4 books with him on a business trip in order to have enough to read. He has never gone back.
Fortunately, the kindle paperwhite has removed my only reservation with reading on a screen with their analog-esque, matte-sheen surface.
Audio books are my secret to falling asleep. For years I had issues with shutting down my brain when it was time to go to bed. I started listening to audio books of books I'd already read as a way to distract myself so my body could settle down. I still use them to this day. I remember loving audio books on roadtrips as a kid, and I remember my parents buying big 12 pack CD's of long books for my dad to take on his mountain commute. Nowadays, I listen to audiobooks for new things as well, since I can sample the narration on Audible to see if I like the performance. PS: I think audio books are absolutely just as meritable as reading in text form, don't @ me.