Ya..

My group is Paladin + 4x Shaman.

The Paladin is Prot (7/58/6) but dual spec'd to Prot/Holy (19/52/0)
Three Shammies are Elem (57/14/0), one is dual spec Resto (0/15/56)

Most of the time, I run Prot and 4x Elemental.
When its harder stuff I run Prot, 3x Elemental, and 1x Resto.

And then in PvP since I cannot force people to attack my tank...
I run Prot/Holy healer using Grid/Clique to click heal, and 4x Elemental.

Everyone will find something that works for them.
Experiment to find your preference.