I have a laptop and when I need to go in a hurry it would be nice. However, I can put it into sleep mode and I am on my way.
You can change what effect closing the lid has on the machine.
Its under control panel/hardware and sound/change what the power buttons...set it to do nothing, then you can shut down, close the lid and go.
As an aside, I've had it told to me that sleep mode is not a good way to go, it can corrupt files. I can't attest to the veracity of that, but I've heard many say it.