I thought it was going to be a feature someone actually wanted...
I have no interest in touching either my desktop nor my laptop screen. That’s reserved for extremely portable devices where a keyboard/mouse is just impractical.
And now, with the latest OSX, all of my docs, photos, music, etc., are accessible on any of my devices, so I can easily work on something at my desktop, go home and pick up where I left off on my laptop or access it on my iPad or iPhone. No syncing, no copying, no reformatting, no muss, no fuss. Seamless. Very easy and very cool.