The virtual tourism aspect is really interesting. Not sure I'd want to work that way, though (I don't even use my touchscreen for work).
Virtual home theater is also really interesting - and some headphones, if not even earbuds, are now getting pretty good at spacial audio. But, again, not sure I'd want to watch all my video effectively 12" from my screen. Curious to see what extended, long-term use of AR headsets does to people's eyes.
But when they make Doom for this, sign me up!