It's AutoCAD, so you hit the escape key, I don't know, 210 times a day if you are lucky enough to only need it every two minutes and you only work 7 hours a day. Say every fifth time you accidentally hit F1 by mistake, that's 42 times waiting for help to come up so you can close it.
Now you are really used to doing this and it would be a really hard habit to break but what if you had a better choice. Here is a lisp that uses Special Characters as the escape key.
(defun C:escape ()
Now add this to your right click menus or assign it to an extra mouse button for an awesome escape.