I think it's just very difficult for most of us to envision a situation in which furor is anything but a way to get to omen of clarity. I'd be ecstatic if it were to swap places with naturalist. That's probably why there is so much resistance though. Most feral druids would entirely skip the talent if it was possible.
Almost all single/multiple add spawns in raid encounters come with enough warning to build up at least half a rage bar. The only exception I can think of right now is Anub'Arak, but bears are one of the least suited to be tanking those adds anyways.