When I was holding presentations with some Eclipse install, sometimes there was a need to use bigger fonts, but that involved quite a tedious work in the user interface. The situation is even worse, if I happen to demo using my main workspace.
This is why I am proposing this new Eclipse theme, that tries to address this need by adding a single, non-rewriting option to the Eclipse preferences to change the theme.
Open the Preferences page, select General/Appeareance, then at the middle of the screen select the Current theme as Presentation theme. Enjoy.
If you are done with the presentation, simply switch back to the theme you were using.