Here's an interesting blog post - should some spells be able to be used in PVE only or PVP only situations? Hell no!

Perhaps it is time that some spells and abilities got tagged as PvP-only or PvE-only. It seems a bit artificial, but it would make balancing a bit easier.

This thought is prompted by the upcoming change to Blessing of Sacrifice in patch 2.2:

  • Blessing of Sacrifice now has a 1-minute cooldown.

It's pretty much aimed at PvP, where Sacrifice is constantly used to break Crowd Control for paladins. However, this change makes Sacrifice useless for both PvP and PvE purposes.