I seriously overlooked this ability for a long time, and started using it a lot more last couple days.

Situations it rocks:
Hunts - Get in that extra damage.
Any 4 man dungeons (non speed runs mostly, but if you've got a stoneskin and regen up on your tank, you have time)
Extremes - Titans mainly aye for medica spamming during stomps. Use on all extremes for extra speed adding dot's to primals, add a few sneaky stoneskins in there and return to business as usual.

Oh crap moment - You're almost out of mana, no shroud. But the boss is not too far from dead, but pounding on the tank. SS your tank, PoM up, dps the crap out of the boss.

Way i see it, with cleric stance up, and PoM i'm putting out a fair bit extra dps, and am a lot more versatile in my role.