As per the solution provided in this SO thread we can get back some screen real estate from Eclipse.
However, when working with multiple editor tabs (e.g. in a quadrant layout) the ever present horizontal scrollbars (even when there is no text extending beyond viewing area!) are a waste of valuable coding space, not to mention, hideous.
Have tried various CSS hacks in eclipse default_gtk.css (on Linux here) all to no avail; it appears that the ScrollBar widget is not modifiable via CSS.
This bug thread on saving space in Eclipse indicates something is in the works for Luna, but the developers seem split, some not caring about scrollbars or any wasted space (assuming everyone has huge monitors), and others preferring a clean and lean UI.
Anyway, if anyone has leads for how to hide scrollbars in Eclipse >= 4.2, do chime in! It's IMO the missing UI "feature" of Eclipse as you can strip out everything else, almost have max screen real estate available for code...just these damn scrollbars o_O