From the Boeing Flight Crew Training Manual for the 747 (emphasis added):
"A rolling takeoff procedure is recommended for setting takeoff thrust. It expedites the takeoff and reduces the risk of foreign object damage or engine surge/stall due to a tailwind or crosswind. Flight test and analysis prove that the change in takeoff roll distance due to the rolling takeoff procedure is negligible when compared to a standing takeoff."
I am inclined to take this at face value since both Boeing and Airbus will do pretty much anything to gain a few kilos of payload.