I did both Scarlet Monastery and Zul'Farrak from 35 to 45, and found SM to be quicker overall.
ZF is a change of pace, and almost as quick.
From 45 to 55, I'd recommend Stratholme, the entrance with the locked gate.
Although a lot seem to like Scholomance too.
At 55, hit Ramparts.
You could try two 80's in the group if you want.
But its more of an issue of only boosting 3 toons at once.
You'll kill faster, and get less for the kills, which evens out.
But then you have one less toon leveling.
If you get sick of a zone, for any level bracket.
You can run the lowbies through quests for their level.
Which will be fast with an 80 killing things.
And are still excellent exp's.
But boosting in instances will be faster.
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