Well, there is one more thing.
The WB spawn after predictable time. This means that if you know when a WB was killed you know when to gang up on the next one. At least on Saoraid the competition for getting to the WB first is huge (even now, after the PoM event...), each WB gets killed within minutes, be it in the middle of the night or in the middle of a work day. And unfortunately, formal queues have fallen apart at some point due to childish fights between guilds. We got only to the level of being civil enough to allow the ones who start a boss fight to finish - the second group/guild that comes starts fighting only if the first one fails. Which kind of never happens... It is really a competition about who gets to the WB first after it respawns...
I am always for the world shouts. But I have to fight for it almost every single time. Really. There is always someone in the guild asking for not shouting. We end up shouting

but sadly actually the argument that wins is not that it's nice and all, but ... that there is almost always someone from another guild watching so it's not such a secret anyway.