I do the same thing but with two physical desks, not just partitioning one desk into two logical desks.

Aside from the obvious advantage of more space it really helps put your mind in a different context when you are at a different location. In his example just moving over slightly would do nothing for me with the computer just arms length away and still in full view.

Yep, even more-so with a corner desk (L-shaped). Although there are times my work involves both papers and computer, and the quick swivel of a corner desk is great.