This is one of the reasons why the iPhone4 straight up doubled the resolution even though it made for kind of a wacky display resolution (as opposed to 1024x600 or something more standard like that)
Mountain Lion is supposed to finally get all that HighDPI stuff right though, according to the rumors.
I'm only really familiar with the Apple side of things though, maybe Metro has similar design considerations in mind.
Back in 2000 I was using 1920x1200 on a 12" laptop. I was running both WinXP and some version of Ubuntu, and they looked fine. Every since then I've had WUXGA screens and displays, until very recently when Dell and Lenovo decided to bail and move to the 1920x1080 short screens.
It's a step backwards.
My guess is that your task bar in XP must have been less than a centimeter tall, the system font less than a millimeter tall. I know there are a lot of people like you who value having more on the screen like that, but realistically, that's not a very large market niche.
The goal at Apple was to keep roughly the same dimensions for interface elements while increasing the sharpness of text and icons. If the user wanted to, they could reduce the font size in whatever application they were using to make practical use of the increased pixel density.
Finally, consider the power consumption of the 3D card required to drive a modern game natively at this resolution
For laptops, the (pretty strong) rumor is that new macbook pros coming out in summer will be much higher res, potentially up to double current resolutions.
For current laptops, the macbook airs and similar PCs currently have the highest "usable" resolutions. The sony vaio z and p has the highest resolutions.
You can search for "Yamasaki Catleap", if you're curious about it.