I'd really like the infinite space for terminals and docs. Maybe turning my head to look over at stackoverflow would suck, but my glasses are thick, so even through the lens vision is blurry at the edges.
I can imagine a goofy hackers style 3d world would be amusing for a while. Even a really pedestrian window manager would be nice. terminals could be very tall, so i could look up to see many commands back. heck, i could float docs where the keyboard is right now.
Full visual field seems neat.