High priority is for urgent messages only. It does bug me as I use an email program that displays the priority. It's simple email etiquette along the lines of not using all caps in a message. Simply put, it is yelling.
On Mon, Sep 27, 2010 at 11:57 AM, <firstname.lastname@example.org>
Because I work in business and send many business related emails i automatically send everything HIgh. Does this bother you?
8871 NW Brostrom Rd
Kansas City, MO 64152-2711