It's a nice way to level up IF you have 1 or 2 other people specific classes to help out.

I tried multi-boxing this kind of boosting, but lots of deaths and getting it right did not seem worth it.

I do 5 or 6 good pulls in LBRS with a Pally and Mage; and good exp for the lowbies.

I ran lowbie Mages 45-55, with Shaman healer 45-55, and 1 prot Pally to goo effect.
Without a mage (Blizzard) in the group, it takes longer to kill, and also I pull smaller batches of mobs.