One of the major changes it has caused in our societies is the splintering of attention and erosion of the ability to confront boredom (let alone the skill to turn it into something useful).
For example, if you reach for your mobile phone when your friend with whom you're having dinner excuses himself to go to the restroom, then that is a symptom. By itself, browsing some news websites or checking your social media feed is probably harmless in this context, but there is a huge opportunity cost in those missed moments where you could've profitably exploited that break to think about things that are important to you and to him.
Perhaps the ensuing conversation could've been steered in a deeper direction had you paused to think in those moments.