If you often need to create construction or reference objects in AutoCAD, have you tried XLINE, RAY, and point? XLINE and RAY are very useful to create construction lines quickly. And points, can help you to snap to a point quickly in crowded drawings!
If you work with AutoCAD layout, these 11 killer macros will help you. For easier access, we put all the macros in tool palettes. A must read if you want to work with viewport faster! Another great post by Paul Munford.