Since we already have a variety of spells and scrolls, why not a variety of Scream? (:
Bulldozer would be a Scream that has half the cooldown of what is, currently, a mini-Battlecry.
Bulldozer does not remove slow effect from units, but rather, shoves them all 3 spaces forward, or to the next barricade.
Great for moving units out of chokepoints, for moving slowed units into action, or for simply getting your units where you need them to go.