Typically not for emphasis pauses, though, just for clause or item separation pauses. I find it disruptive to visual parsing when they're used this way because I don't expect it. It's becoming common to use sentence breaks ("Every. Single. Day.") to express things like that, but that bugs me since it implies a falling tone on each word. Personally I'd prefer ellipses ("every...single...day."), but that's not perfect either. Writing is always an approximation of speech.