i don't doubt it. i have it turned off for this exact reason. depending on what you're doing with your phone, having it vibrate a bunch of times (maybe 50 a day?) isn't going to save you any battery life. it could be extremely trivial, or it could be another little thing that adds up to having awesome battery life (i am confident saying my droid is now at least equal to, if not better than, a blackberry curve in battery life)