uEFI is a big nothing as Ross Ridge said
just about partitioning and big partitions and drives bigger than 2.19TB
Absolutely no need if you dont start buying 2.5TB and 3TB drives
But
IF you do, Win 7 install is fully capable of setting up your HDD in perfect GPT if it detects it in bios. If it doesnt you are SOL.
HOWEVER, EFI
is absolutely necessary if you want fancy bios graphics and KB and mouse and screenshotds.
MSDOS MBR just cant do that. I saw a review where ASUS specifically mentioned the code for graphics and all the AI is in C++. Thats why the flash bios has to be 32MB
as a matter of fact, the extremely boring old school black with white text only Gigabyte P67 bios just recently had EFI added in a bios update
but remember - NO graphics
Basically, ASUS P67 bios are three headed............
MSDOS MBR,
EFI GPT,
C++ graphical intelligent interface
And the chance of some manuf coming out NOW with an EFI bios update on any mainstream mobo prior to P67 is zero and none