Although I prefer to work with text in editors, and not in word processors, I sometimes have to. Today I faced a massive editing task in a formatted .rtf document. I had to iron out some "bugs" in the text. Such as no space after a dot:
FOOBAR.Foobar.
Now, going through this massive text and look for these occurances manually clearly wasn't an option. I'd rather eat a cactus. Had it been "normal" - not formatted - text, I could have used regular expressions...