Back when I first started healing, I was under geared and had to work really hard to heal by focusing in on that one aspect of the game. After I had gear I started to heal less and less, and began to blame others more and more, if someone were to mess up a CC pull I would either be shocked or angered by this moron who messed up something so simple and stop healing completely or less then I would have with no gear.
I feel the nature of this behavior was rooted in me being more susceptible to being kicked because I was under geared, so I had to work harder in order to succeed (even if the fault was on others) and be to the very least acceptable.
I made this post because I decided to one day queue for a Dungeon as a DPS with a 40minute queue, I thought this was okay once in a while because I always get 6minute queues a healer. The q pops, I get in, I was the highest DPS in the Dungeon (nearly 40%-50% of damage done in a boss fight). So on our way to the last boss one of the DPS messed up a CC pull, I knew the healer could have healed it but he falls into the same trap I did, his mind was so focused on the mobs hitting everyone he decides to stop healing completely and began to blame others. From a healer's perspective I would've healed it, if it were me. I was kicked shortly afterward (bare in mind this was all random with only 2 being from the same server).
I think you all would be surprised by what a healer can salvage if they were to try. Sometimes, spamming heals are the way to go, stop thinking about conserving mana on the most ridiculously short PULLS, it's not even a boss! just drink your free food right after you're out of combat, like if you were an Arcane Mage (zero mana at the end of a fight because you know when to use up or save mana). I rarely see people use their 3min + mana regeneration abilities, to all the healers out there, DO SOMETHING.
Shut up and heal.