I can see both sides of this coin, and here's my 2 cents - although it is a rehash of what is said above
I can still heal well enough on end game content with my melee Horc FvS - but a point mentioned above to me is the big take-away of this - epic items (and lvl 20+ random items) for melee healers being no where near the equivelent that arcanes and non-melee divines have (ex the epic mask of comedy being 78 divine spellpower.... c'mon really? I'm not saying it should be 108 because it was never perfect, but what about bumping it to 90 being an epic item for healers? - and to take into consideration the epic ring of elemental essences - same chain - 90 sp for fire/acid/cold/electricity on 1 non weapon item for arcanes). Divine spell power on more items other that weapons and shields (and in better than 50-70 amounts you typically see on lvl 20+ items) would make me perfectly happy