I tried this for about 6 hours straight using the DK2, and there seems to be a sort of catch-22.
By default, the resolution is not high enough but your head stays stationary as in this default you can see the entire screen from the default head position.
Virtual Desktop allows you to zoom in, and this then works wonders. However, you need to start moving your head to see the corners of the screen. Naturally, your neck muscles become the first bottleneck.