About frost dks 2v2s

[:1]Umm, i was wondering as a frost dk. Should i spam ns on healers or should i just roll them with my regular attacks.
if (can kill spamming regular attacks) end
else (spam NS)

Thanks
Eh, I don't use it that often except against Priests.

But, then again, 9/10 post 1800mmr teams are Warrior-Priest, so I guess 'often' is a relative term.
What about on a resto sham?
I personally pee on Resto Shamans all day long, so I don't use it.

If they give you trouble, though, it may prove useful depending on what your partner is.