My fellow warrior ferretwraith, people complain about warrior in harder fights because curing becomes more involved. As a warrior, we get access to self recovery that plds don't, but the have better damage reduction and prevention then we do. As a result, plds get more invites due to the healer having a fairly obvious point to begin healing at, whereas warriors can get to half health and effectively restore it much quicker and maintain hate. Long story short, plds are for lazy healers who rely on cure spam, warrior are more detailed and require more attention but are more cost effective. Just don't stack wrath for an entire boss fight when a quick inner beast can recover an easy 1/5th of your health in a single move.
For reference, my war can do the damage combo (heavy swing-maim-storm's path) to boost damage and lower enemy slash resistance, pop berserk, drop inner beast once for 500 and effectively restore 1500, use Infuriate and restore all wrath, pop a second inner beast for another 500 damage and 1500 health, and then follow up with thrill of battle for 20% hp restored and a boosted 20% hp for a few seconds. This is in the span of about 6 seconds after doing the damage combo. My standard inner beasts with maim and storm's path used will generally do 350+, for a quick 1000 health, so options are always present for quick health.