Not really looking for a debate here, just some insight.
I've been playing a pally all throughout WotLK (a hunter / priest previously) and just returned from a month or so break (just experiencing 3.3 now). In the days of naxx I generally stuck to HL and had my occasional mana problems, primarily on Patchwerk, the majority of my mp5 came from food/flask. Now ever since then, i've moved on to FoL, 42% crit on my FoL +2300sp. As far as I can tell, my mana is still quite low in comparison to other healadins.
So that's my quick little bit of info, so my question is why HL?