But the real point here isn't what apps he used, it's just how different his homescreen looked when he only put what he used on there. I'll admit it: my iPhone is a mess -- I've got icons all over the place, and they don't seem to stay organized even when I try to organize them. But organizing according to actual usage is a great idea, and undertaking the same experiment on your iPhone might actually clear some things up for you.
It's also worth pointing out all of that empty space on his homescreen: he has four more slots there that aren't used at all. Apple, are you listening? I'd guess Patrick's usage is more common than Apple may think -- there's plenty of room on the homescreen for other functions and information.