So maybe this is old news to most people, but I bought a mac mini a few days ago for app building (dev on a windows pc for speed, haven't owned a mac pc in many years) and as a fairly new watch owner I was very happy during the Mac setup when I was asked if the Mac could unlock itself when the clock gets close.
IT is an impressive integration! The integration of the watch, iPhone, iPad and desktops is top notch.
I also like that at home I don't have to carry the iPhone around all the time, as I can answer calls on my watch.  44mm SS black.