The secret power of these apps is that I don't waste time reading bullshit in the Internet. I see an interesting page in HN, go to it, click in "Read Later" and Instapaper will send it to my Kindle. Now there's 99% of chance that I'll never read it, but I won't fill the urge to read it instead of working. Win! Win!
That's mostly what happens to me. And then I travel, or I go to a cafe, or I commute. And either because I don't have internet, or because I am in a different setting, I open Pocket. And then I read, I read, ... only the good content I knew I would want to read given the right moment, the right amount of attention.