@markewi said:
The Measurement box isn't too handy...
You're right. At least if you don't learn how to use it. Read the Help article mitcorb linked to. If you want to move entities to a specific location relative to the origin, use [x,y,z]. If you want to move things to the ground plane, you can use [,,0]. What ever point you grab with the Move tool will be located at the ground plane.