Healing is harder because of mana costs and heal per spell versus damage taken and total health pools.
Reassessing spells and changing tactics is necessary for each healer because of this.
Healers are less able to cover the mistakes of others compared to how much they could do so in the past.
Nonhealers do not understand this yet, on average, and think their healer sucks.
Nonhealing roles need to adapt to reduce their own incoming damage via proper play with CC, kiting, mobs being on the tank, and mobs being taken down in order based on the situation.
As it is many healers are frustrated due to:
- Others not understanding the added challenges the healers have to face due to the healing changes.
- Having trouble making up for the mistakes or poor tactical decisions of others and thus having people die
- Feeling as if all the improved stats and power they've worked to gain to 85 actually makes them less powerful, less epic, and ultimately less useful than they were at 80. **! (I believe this worth some additional emphasis.)
I can see how Bliz wants to make content harder but the first person that gets the extra strain is the healer as they are the ones expected to make up for the mistakes of other people the most. Tanks handle mistakes from incoming adds and healers handle mistakes from incoming damage. (Remember it's a mistake if the damage was avoidable.)