Actually, you won't even have a faster fermentation probably. The excess yeast will just drop out when there isn't anything to eat. It may taste "yeasty" for a while, but that's about it. You probably didnt' even overpitch by much. One package of dry yeast is good for up to 6 gallons of wine/cider, though, so no need to double up next time!
Broken Leg Brewery
Giving beer a leg to stand on since 2006