Other benefits for using a CAD application are Layered Drawings, linking other drawings to one drawing without affecting the linked drawings
As an electrical engineer dealing with signal processing circuit boards and chips, I find "layered" drawings a real pain to deal with. and drawings that just have arrows and lines pointing to wire names. The problem comes up when I want to know where a certian wire node all connects to. A single sheet diagram with lines running all over the place is actually easier for me to find out where all a signal goes. If all I have is a signal name, I have to spend a lot of time hunting around to find every destination of that signal. If I needed to modify a signal, I need to know if something else is using that signal than the destination I know about. Layered diagrams make this very difficult to satisfy myself that I'm not going to much something up.
