I think many people have forgotten the power of Prayer. Sure, it is a nice little buff. Cast at the beginning of a quest or raid, it provides everyone a handy bonus to attacks, damage, saves, and skills. But how often do people remember about the other side of Prayer, the darker side? For those who have forgotten, or do not know, Prayer also gives the enemy a penalty to attacks, damage, saves, and skills, and there is no saving throw against this effect.
That's right, for the low cost of a Prayer spell, you can kill 5% more creatures in the Vale with a Wail of the Banshee. For just 20 SP, Mass Hold will land 5% more often, and last 5% longer. 5% more creatures will succumb to the soothing power of the disco ball. And this will work anywhere in the game. It works in the Vale. It works in Amrath. It works in normal quests, and it works in elite quests. It even works in epics and raids!
When was the last time you saw a cleric cast Prayer in the thick of battle? If you can't remember, maybe it's time to start spreading the word. Who knows, maybe you'll earn some converts.