Don't get me wrong, I use it all the time, I'm only arguing against its use by default. On some fights it is VERY good, but on others I get zero use out of it. Let me give you an example - I took HA for Magaera thinking that it'd help with aoe throughput during rampage.. which it would have.. except for the fact that we had real raid cooldowns available anyway and I hardly even needed to heal. You can see
HERE if you select Wilferel how even though I'm sure HA was available at that point, I didn't really need to do much healing since we had boomkin tranq available. DP on the other hand would have saved me mana throughout the fight and generally allowed me more overall throughput.
HA has its uses and when its good its GOOD, but I think people shy away from DP when perhaps they shouldn't.