Anyone ever mildly paying attention won't be caught off guard by a sprinting tank. In fact it should be expected of tanks to do so. When the fights over what else is the tank going to do? Just plop down for a group pep talk? Of course he's going to head to the next pack, and utilizing a free sprint is a no-brainer.
As a tank it's frustrating to pull a group only to find that the BLM and Sam were right on your heels every step of the way but your healers refused to pop sprint to keep up, forcing you to waste Living Dead or equivalent.
As a healer it's likewise frustrating to go watch a tank jog along getting clobbered by each addition pack he grabs while I'm sprinting circles around him trying to get him to wake up and stop taking avoidable damage without ripping agro by healing mid pull.
Sprint pulling is a win-win. The sooner it gets more widely utilized the better.
