Agreed. Vista hauls [censored] on this box (Core2Quad Q6600 OC'd to 2.94Ghz) 2GB of RAM and also on any of the ASUS laptops I have deployed to clients in recent months, all of which have been of the Intel Core2Duo family. Battery life is superb and the machines perform extremely well.
Whilst my primary OS on this box is Gentoo Linux, I do boot into Windows to game, and I have had no issues with Vista whatsoever.
On QUALITY hardware, Vista functions quite well, and the 3D-accelerated desktop and "Unix-style" memory model indeed make it a more "efficient" OS, it simply has more overhead, which is why it likes RAM.
In my experience, those who dislike Vista, are running it on sub-par hardware, with an OEM pre-load so laden with [censored] that it would bring any machine to it's knees. Hardly the OS's fault.
If I had ANY doubts as to Vista's capabilities, I would not be deploying it to my business clients........ But I am, and they love it.
Network Engineer/MCP