This is one of the most irritating phrases of all. Obviously the speaker is saying something. Whenever I hear it it makes me want to say "You've made your point. Now be silent. Better yet, next time you want to fill the air with noise, think again." It's a waste of words but is also a sign that someone wants to have the last word. Control freaks and those who are insecure tend to be the worst offenders. Be quiet! Don't "just say" -- button it!