If you are running W2000 just pressing the off button and powering off - as opposed to shutting down or whatever via the screen - works very quickly and just fine.
The only advantage in going via the Hibernation or Stand By logic - comes at restart time - especially when your start-up process is long and slow...
In stand-by mode a small amount of power is consumed - so in the end a laptop will run out of battery (mine takes 3 to 4 days but its decreasing with age of course). In hibernation mode the machine is really OFF, but triggerable by arriving activity.

me too