I have a strong everquest/wow background and still play everquest.
/who on pvp servers is my first line of defense to preventing pk and knowing when ally already there farming.
Since you already have notices that shout out that enemy is doing something I don't see this as detrimental to the game play.
The additional uses of /who is also nice for
seeing where people of your level are playing
/who all 10-15
finding someone of your class to ask a question of regarding your class
/who all assassin 40-50
etc
I've tried the command and looked around but havn't seen anything that even comes close in the interface. So I'm here suggesting it or asking to know how to do it if I've missed it.