But those of us who dwell in a black screen with white monospaced text and a flashing cursor need to make more human interfaces if we are to make computers more accessible. Movie OS is possibly overkill, but devices like the iPad show promising signs of progress in HCI.
But I close my new intuitive iPad app by stroking the background image to the top left? Or turning the window upside down? And of course it's different for each app.
For what designer interfaces do for you - take a look at all the non-standard, non-rectangular DVD/Mp3 player tools installed by random hardware makers.