Although I don't really support this feature at all, the only use I've ever seen for it is "oh there are irc ops on the channel, I better stop my spamming", but, nstead of using a /who nick when someone joins, it will be slightly more bandwidth efficient to /userhost nick. On most networks, /userhost will contain an * after the nick if the user is an oper. /userhost returns less information (no channel name, no hop count, no realname) so it is slightly less bandwidth being used.
