Instead of locating my mouse cursor and trying to align it with precision over a scrollbar control that is far away from the content I am looking at, I've always just wanted to flick the page up or down.
I've talked about this before. I owned a touch screen laptop long before Win8 came around. I constantly find myself dismissing dialogs with the touch screen rather than using the keyboard, trackpad or even the mouse (I use a mouse with my laptop frequently). It's easier, more intuitive and with the exception of using the keyboard, faster. I also scroll fairly frequently using the touch screen as well. On the desktop things will be *slightly* different, as the monitor is a bit further away. However, I *have* wanted to purchase a touch screen monitor because I love the touch screen on my laptop so much.