I’m probably the last one to learn this key combination to lock computer. Before this week, I was locking my computer by pressing three-finger salute (Ctrl-Alt-Delete) to launch Windows Security dialog and then press Enter key in order to lock my computer. Starting this week I’ll be pressing only Windows Key + L.
I figure by pressing Win+L I’m going to save half a second per each instance. Let assume that I lock my computer 6 times a day. It means I’ll save 3 seconds a day and this adds up to about 18 hours minutes a year.