If you can excuse the language, Louis C.K. has a great explanation for why smart phones are taking away a part of our humanity:
I don't necessarily agree with the "great sadness" part (and think you can replace that with "boredom"), but completely agree that smart phones are doing something horrible to our attention spans. I keep coming back to the idea that we are all made to have some evolutionary pleasure response to interactions with other people and that being inundated with unlimited means of "cheap" connections have "cheapened" that response, and probably dulled it.
Looking at your phone, regardless of the circumstance, communicates that something more important is somewhere else. I have a horrible screen addiction, but small nudges like Louis CK's bit help me get the reigns back, even if only for a few days.
Have a great Tuesday doing what you love!