I'm confused how your fury warriors can put out that much DPS without pulling aggro? Are they using Tranquil Air instead of WF for this group? You're talking DPS on the order 1.1k DPS to really past rogues which is going to be very sketchy on aggro for a class with no ways to remove it besides various 2 minute cooldown items.
Druid main tank and a bit of lead time gives the warrior a great bit of buffer. Salvation is assumed, as well. KTM makes most of this sort of thing relatively trivial. At 1.1k DPS, assuming a straight 1-1 DPS:TPS ratio, berserker stance + salvation puts the warrior at 616 TPS. Our druid hangs around in the 700+ range pretty easily.
As a rogue, I VERY rarely have to use my threat control abilities in raiding environments. I generally only have to if I am undisciplined and jump the gun too early, which is a player problem, not a class limitation.
Edit: The only place I can think of where Vanish's threat wipe is a huge advantage every single time is on the Curator during Evoc due to the non-scaling nature of warrior tank threat as damage taken increases. Vanish just before the Evoc lets me pop AR and beat the hell out of him with reckless abandon. A warrior couldn't do that as carelessly.