PLEASE DO NOT CONFUSE THE QUESTION WITH "WHAT IS CURRENTLY OVERPOWERED".
I'm looking to start playing WoW again and I'm too old for twitchy gameplay and complicated rotations (I'm looking at you feral druid savage roar management or priests shadow word:deathing cc).
So what specs (either dps or healer) have it the easiest ? The easiest rotations, easiest cooldown management etc. The spec does not have to be op or represented in arenas.