Many good things came too MoP. A big one is the bug fix where hunter pets are now called with 100% of their health and stats. Many other things changed. Pets no longer have a pick-list of talents and hunters can no longer tweak a long list of little things to be better "pet-tanks" or "healers". MoP takes broad brush strokes and different spells.
I'm thankful that the Hunter Healer macro I put together still works. I'm impressed with the results.
In order to use this macro without change, you'll need five spirit beasts all in your callable stables. If you don't have five, don't worry. You can still enjoy the knowledge and you can modify the macro to your needs. The trick with having five is that Spirit Mend has a 28 second cooldown. But the cooldown is specific to the pet and the cooldown continues if the pet is active or not. So we cycle through each pet: casting spirit mend, dismissing, and calling the next pet.
/console Sound_EnableSFX 0
/cast [@mouseover, pet][pet] Spirit Mend
/cast [pet] Dismiss Pet
/castsequence Call Pet 2, Call Pet 3, Call Pet 4, Call Pet 5, Call Pet 1
/console Sound_EnableSFX 1
Each dismiss takes two seconds and if you are cycling through and not attacking anything and just healing then you'll hit the cooldown. If you burn through your first five pets and heal as fast as possible then when you're back to the first pet Spirit Mend will be on cooldown. But if you're attacking, and letting your pets attack as they come in, and moving around, then you'll never hit the cooldown. Of course if you're attacking then you'll get more +RAP things to proc so your healing coefficients will be better.
Spirit Mend heals (1371 + ((RAP * 0.35) * 0.5)) plus an additional (527 + ((RAP * 0.35) * 0.335)) over 10 sec.
Here's Kheldul showing this off in an updated hunter healer macro video. In it, keep an eye on the buff bar as the pets heal Kheldul. You'll be able to see spirit mend HoTs rolling. Three separate HoTs are certainly shown. Four HoTs seems possible.