So I managed to hit 80 on my goblin warrior the other day. My total played time to 80 was 3 days, 6 hours. Just slightly more than half the time of my previous best. Really amazing how much they've improved the leveling speed. Obviously guild xp bonuses and two more pieces of BoA gear also make a substantial difference.
So now I shed 3 pieces of BoA and continue on through the Cataclysm content. I'm curious to see if I come in significantly better than my previous record which was around 22 hours played from 80-85.