I disagree with the "trash meter" comment. For one, players Rohan Gold do care about trash. Elemental shamans and rogues for example felt like there was so much AE'ing going on that they were not attractive specs for raids. Players can say "nobody cares about trash," but we don't buy it. Raids wipe on trash. Raids are called when trash respawns. For speed clears, to satisfy a hard mode achievement or bear-mount style challenge, the rate at which you can clear trash very much matters. If it didn't I'm not sure you'd mind a Volley nerf at all.