Yes, I am.
All demo damage barring doom (~20% of your total damage) comes from hardcasts that then need to be empowered. Pets for pets, you got felguard to affliction's supremacy doomguard.
Afflictions second top damage source is Agony, an instant cast. Following that, it's corruption and siphon life. Even if movement forces you to not MG a couple of UA's, it's still more damage on the move than getting off a hand of gul'dan and not being able to empower it due to being forced to move/interrupted.
What the fuck do you have for mobility as demo, the pathetic Demonwrath?