Wow. Over 60 pages. This topic keeps coming back, and for the life of me I don't get why.

When you're new, sure, take it easy, learn the fights, etc. No problem. But if you are perfectly capable of throwing out DPS, and you just refuse to because you don't feel like it, or you are clinging to some sort of principled stance that healers "shouldn't" DPS because they're called healers, then that's just bollocks. Having a green, instead of red or blue, icon next to your name does not entitle you to stand around doing nothing for 50% or more of a boss fight. Get over yourselves. If you have absolutely nothing to do in terms of healing, status cleansing, or defensive mitigation for several GCDs worth of time, and you spend those GCDs actually doing literally nothing (or just overhealing like there's no tomorrow), then yeah, you're kind of a lousy healer.

It's a bit hard to fathom people defending this. Standing around or doing the Moogle Dance because you have nothing better to do at that time and refuse to cast offensive magicks just because isn't a "playstyle." It's letting your party carry you, and disrespecting their time, and for what?