Guys- healing amp is not as important if you are getting healed/Mass healed. Where it does come into major play is when you are taking a ton of damage and are being healed via scroll or a combo of scrolling and blue bar healing.
There are times where you can't use JUST Heal/Mass Heal in a raid healing situation. There are cooldowns- smart healers or healers who want to conserve SP will alternate scrolls and whatever other cures they may have off timer.
In my opinion, it's just silly to not take some form of HA, unless there's absolutely, totally no way to fit it into your build. Even my Clerics have healing amp-- at the very least, I'd suggest having an item to swap in, such as Levik's or a Finger Necklace when really needed.
You know whats supa dope? Healing someone with only heal scrolls, and the fvs capstone. And it working just as good as a spell on them as the other spells do..