Okay now that discussion died down on paladin forum, I got a confession to make.
I have used HA on one fight in both T14 and T15. That was Garalon in HoF. Ofc I tried it sometimes, but always found it worse than the other choices so Garalon was the only fight that I actually chose it over the others. But that was because I was playing with EF!
I loved that. Popping HA and blanketing the entire raid with EF, was a huge raid healing CD.
Not sure so many people used HA as a cooldown to blanket raid with EF, I like the idea, sadly SS is to strong on most fights.