To this day I regard WordPerfect 5.1 for DOS as one of the finest word processors ever conceived. I might still be using it today if Microsoft Word had not become a standard (and if I didn't need to do any kind of graphical stuff). Tons of easy-to-use features and no distractions. It still has some minor support at http://www.wpdos.org.
Do you have any applications you remember fondly?