Last weekend my multi-boxing experiment ended, when with the help of my wife, who ran my two characters through some dungeons like Scholomance and Stratholme, the duo reached level 60. Now the purpose of the experiment, besides getting the rocket, was to boost my druid to level 60 fast, which I achieved in less than 100 hours. Compared to my very first level 60, who took 500 hours for that, this is quite an acceleration, although even without multiboxing you can get to level 60 easily in under 200 hours. But then of course the rogue on the "recruited" account gained the ability to grant levels to characters with less levels than him, which enabled me to boost a level 40ish bank alt shaman to level 60. And then I just couldn't just delete the rogue, but paid 20 bucks to get him transfered to my main account. So there I am, with three new level 60 characters on that account.
At least the druid has a plan where to go from there: He's healing his way through random Burning Crusade dungeons, because I just can't stand questing in Hellfire Peninsula any more. With a healing spec getting into random groups is fast enough, for the dps characters using the Dungeon Finder as sole method of xp gain would be significantly lower.
Once again I'm slightly cursing a minor design flaw in the Dungeon Finder: From level 15 to level 70 the first dungeon of the day hands out a satchel of helpful goods, which contains a blue item with an iLevel corresponding to the dungeon's level. That is actually helpful in the old Azeroth dungeons, because the item is always of a type you can wear, albeit not necessarily for your talent spec. But in Burning Crusade the item levels got a significant boost. So the blue items of lets say iLevel 62 you'll find in the satchel of helpful goods are much worse than the green iLevel 87 items the trash drops. So basically the extra reward is guaranteed vendor trash, which in my opinion isn't optimal design.