Ok thanks michael!
I guess the other side of that is peoples particular setup and job at hand...
So i work in "inches".... But if i start modeling a 175 foot object (or i guess sci fi guys modeling 1000 foot spaceships), things start moving away from world zero...

Does changing my unit system to feet or meters or miles change that initial interaction with "how far away from zero" i am?

Is there something like a "scaled environment" where i could start a project with an initial declaration that i will be modelimg at "a larger scale"? (I guess that would mean i couldnt model detail then, because it was expecting BIG stuff, side effect......)