“They are actually two different styles of use, MS should perhaps recognise this. They COULD produce two OSes in fact, work and lifestyle say, or they could make it easy to switch between modes. Or.. they could sell a work version without the metro stuff.”
This is the whole point, they want one OS that provides the experience you want when sat at home on the sofa, and the experience you want when in the office, so you only need one device.
I’ve got a single touch enabled device for work and home, at home I spend most of my time on the metro interface, at work I spend most of my time on the desktop interface.
Switching between the two is easy as you just click on the Windows key. Starting things is easy because you just click on the Windows key and start typing what you want to start, I really don’t miss the start menu now, but I did to begin with.