Definitely. I'm currently reading The Reading Life, a collection of C.S. Lewis' musings on reading, and I couldn't recommend a better set of arguments for the value of books in general (though it does have a humanities flavor).
As others have noted, the stuff you find online usually isn't nearly as deep or interesting as what you'll get out of sticking with a good book, nor is the reading experience the same. For historical reasons, the way we consume text on a computer is rather sporadic. The internet, generally speaking, is a giant distraction machine; it's not meant for deep reading. Maybe one day it can be, but not today. Of course, your mileage may vary.
As others have noted, the stuff you find online usually isn't nearly as deep or interesting as what you'll get out of sticking with a good book, nor is the reading experience the same. For historical reasons, the way we consume text on a computer is rather sporadic. The internet, generally speaking, is a giant distraction machine; it's not meant for deep reading. Maybe one day it can be, but not today. Of course, your mileage may vary.