The non-idling rule is there to give people with a problem privacy while we investigate the problem. As we're usually in game aswell and in quite a few channels on IRC, it's best to call us by name, so we get alerted by a notice that someone is trying to get in contact.
Do keep in mind though, we're also policing, handling petitions, and involved in other tasks, chats, wikiupdates, forum replies and such. We can't always respond within a minute or so. Sometimes the notice gets drowned in other messages too.
Although for most players, we are invisible, and what we do is usually not noticable, we are busy people.
In general... Have a little patience. And first think if you really need direct hands-on response by a GM anyway. Bugreports and petitions usually work the best. One example of needing hands-on response is when your character got stuck, or can't logon with a character because it went out of bounds.
If you really need one of us, and don't get a response in, say, 5 minutes: Nudge again, maybe someone else?