I currently have windows media center showing channel 4 on my big screen (TV)
on screen 2 I have a browser with my webmail , along with my VPN connection window and the volume control for the midi keyboard.
On screen 1, I have this browser window, another browser window, some sticky notes and explorer open.
since I am watching TV, but occasionally playing the keyboard or reading webpages at the same time I am definitely suing more than one of those at exactly the same time.
but on top of that it is a hell of a lot easier to switch tasks with three screens and no limitation on how many windows I can have open, or where I can place them.
When I am working it is not uncommon to have 16 - 20 individual applications open at once, including VM's and remote desktop sessions & to be referencing, comparing or duplicating content between those windows & applications.
How does win8 handle three large screens? Personally I'm not willing to risk my current well honed workflow to find out.
I think Bob O'Donnell had it right at the end of this article http://www.theregister.co.uk/2013/06/05/microsoft_windows_81_demo_computex/
“I think Microsoft and Intel need to come together and focus on the core productivity benefits of PCs and not let them get distracted with trying to be all things to everyone,” he added.
“PCs are still better at many things than tablets and smartphones, but I think that message has been lost and needs to be revived in order to get people focused on the benefits that PCs offer.” ®