There are several "workarounds" for this:
1. Don't use the mouse. Editors like Vi(m) and Emacs make the mouse obsolete, if you use browser plugins like Pentadactyl, Vimperator, Vrome, Vimium, ... , keyboard shortcuts for your WM/DE, file-managers like Ranger or Vifm, ..., you will hardly need the mouse at all. Only exceptions are Flash content in a browser and programs were using the mouse is necessary, like GIMP.
2. Edit the preferences of your editor so that highlighted text has a very annoying color, so that you see it instantly when you have text highlighted.
3. Look at the screen what you are doing. If you are able to touch-type your eyes shouldn't normally leave the screen.