Aye. Having buffs on your pet helps in quite a few ways for quite a few specs.
For any build with Demonic Knowledge. AI, Fort, MotW, Kings, Blood Pact, Commanding Shout and Sporeling snacks will help by increasing your own spell dmg and also adding to the survivability of your pet.
For any build with Dark Pact, AI, Spi, MotW, Kings, Wisdom, and Sporeling snacks will all help by increasing your Imps total mana pool as well has his mana regen. Meaning slightly less need to Dark Pact, and much less need to Life Tap.
Melee oriented pets(Felguard, Felhunter, Succubus, or Voidwalker) can all benefit from Might, Salv, and Kibbler's Bits. Salv is only useful in PvE obviously, and doesnt really make THAT much of a difference as you will probably have a tank who shouldent let a PET pull agro anyways, this is probably more useful for a Felguard, although I have never raided as a Felguard spec so I cant say.
For Any builds with SL. Fort, MotW, Kings, Blood Pact, Commanding Shout, Sanctuary and Sporeling Snacks will all help to increase both your own and your pets survivability. This holds true for both PvE and PvP.