I took the raw healing for LoD and the Raw healing of the EF hot. Added a gem worth of Intellect, Mastery, or Haste and compared the outputs. I have factored in all raid buffs and modifiers to things like Intellect.
Haste is harder to conceptualize but if you math out the number of extra ticks you get over a period of time you can get a solid number. As an example of 90 seconds of burst (Thok) 0.9% haste (320 haste gem) adds 1.1 ticks of EF (if you have 3 rolling with 3rd haste BP). That value ends up being 33k healing. 160 Int only adds 14k in extra hot size over 129 ticks.
Is it extra healing when you want it? Larger IH heals are > anything else as shields are king and have the lowest over healing. And 1 extra ticks of healing hardly seems wasteful.
Edit: Lost a zero