When I am at work, sitting at the desk, I don't like the phone in my pocket, so I lay it on the desk. Often I will get up and move about the office to talk to others, and not pick up the phone. Many many many times I have gotten calls or other notifictions when the phone isn't in my pocket, but the watch is on my wrist. The same happens at home all the time. I will be upstairs, and my phone downstairs, a call come in and I take it on the watch.
When walking on the streets or in a mall, I would often not hear my phone ringing in my pocket, with the watch I get those calls and notifications. It is a great extension to the phone, and something that now after 1 year of wearing every day, I would not do with out.