I've been doing this a while now for architectural stuff. I want a detail in my drawing: I drag the detail block in from explorer, and insert it in paper space, then scale it by 1:10 or whatever scale it is. Nice, neat, quick and no horsing around with viewports and model space.
I have run this technique past a couple of Cad monkeys and ......they are unanimous in their condemnation of me......how dare I insert geometry that is not 1:1?
In my defence, I claim any fool opening such a drawing will immediately see that this is indeed a block and it is in paperspace....so what is the big deal?