Only just taken my level 61 team out of retirement. My life is made easier by having a level 71 healer, but I try to offset that by gimping his healing.
(It is still easier though).

So far I've completed :

@ Outland
-Ramparts (Didn't complete the end boss till 63 on the shaman 62 on the tank - but was doing the proper way not the multiboxer way)
-Blood Furnace @lvl62/lvl 63. Piece of cake. Completed this the first time. Two shaman died on the last boss due to bad positioning for his aoe blast.