Homogenization is a risk. Totally. It’s something we try and fight against. In the case of healing, we don’t want to erode the unique aspects of the 5 talent specs. We just want to move the non-unique parts closer together. If you need an analogy, we’re not going to mess with the flowers or the fruit or the shape of the leaves. We just want everyone to have similar roots. Spells like Circle, Chain Heal and Beacon will continue to be an important and unique part of your repertoire. We just want to make sure everyone has the basic tools so that they aren’t in a situation where they’re trying to tighten screws with a hammer.

Now having said that, there are a couple of exceptions. If you are a Disc priest who loved to use PW:S and nothing else or a Resto druid who loved to use Rejuv and nothing else, then you will probably need to use more of your buttons again. We don’t want to promote the strategy of trying to pre-heal as many people as possible without really worrying about who is actually taking damage. There’s not a lot of decision-making or coordination or reactive gameplay there. Disc priests will need to actually cast heals (and Penance can certainly be one of them) and druids will have to mix in some direct heals along with their hots. (Source)