I have a pretty decent lineup of devices with touch.
The interactions aren't the same on the iPhone as they are on a Galaxy SII phone, not are the same on iPads or on a Nexus7. Magic mouses are also special things. Also my Samsung Windows 8 laptop has a 10 points touch screen.
With Windows8.1, I find myself using swipes and touches for a lot of things. And it improves my productivity.
Once equipped with a thing like Classic Shell and boot into the desktop right away, Metro apps are really nice little things running in the background and can come fast with a little swipe (cool ones: Skype, Music, PDF reader of a documentation, like a chapter of a Pharo book: swipe: PDF, swipe: Pharo, swiper: PDF... and mouse pointer not moving around).
When using my MacBook Pro, I am reaching for the screen and being disappointed to realize it is not touch (Apple, give us touch screens on laptops).
Form factors affect the usage patterns as well. But touch is not going displace touchpads or mouses for fine grained control.
On the contrary, I tested a Leap motion controller and it felt like crap.
Phil