And what's REALLY interesting is swapping to play a completely different class like a Protection-spec Paladin (all the armour. All of it. You will never die.) or Shaman (my personal favourite - amazing dual-wield damage, spells, healing, all of it).

I think the intro areas used to be very calm and slow, but they've brought the CRAZYPLOT intros in with Cataclysm. They did it first with the Deathknights intro (lvl55+) and people liked it.