Whether or not I DPS generally depends on how the very first pull (or the first few pulls) of the dungeon goes. It will pretty much lay the ground-work on who I'm dealing with. There have been dungeons where I've barely had to throw a cure... and then the next run of the same dungeon, I will have a group of people that are either new to the game (which is cool) / rocking low gear (which is cool if you're new :P) / or the whole group is just sucking for whatever reason, some groups have no cohesion, some people are being derps, what have you.
Point is, in the latter circumstance, we will do the first pull and I will normally find out almost immediately that this group is taking more damage than others or that we have agro problems or what have you, and I need to focus on observing health bars closely otherwise we're probably going to die. I do not have time to muck around with dancing in and out of Cleric Stance to DPS just because someone thinks watching health as a healer is "lazy".
On the flip side? I am not going to stand there and watch someone's full health bar fight after fight just waiting for an opportunity to toss a cure. If the fights are going that smoothly then I am definitely gonna do something with my time, which generally means DPS.
This sort of thing is all about knowing what you can and cannot do within the confines of any given group. Observation and reassessment is key at all points.
There is no such thing as "A healer should always DPS"
There is no such thing as "A healer should never DPS"
Get over it.
