Let's be real here. People will keep standing in trash void zones which deal like 80% of their hp over 6+ seconds, but when in comes to Stormsong... As soon as they get MC'ed, they'll perfectly dodge all the orbs - probably dragging them toward the healer, too. I guess their reasoning is "I don't have any buttons to press so I'll just keep running around like a moron."
And it's the same guys who keep pulling extra mobs with 75% damage reducing aura, because they think that doing 25% dps makes things die faster.