I don't know how DLC dungeons go but in base game dungeons I often end up in a group that doesn't need a healer at all, or with inexperienced/low CP players who get one shot by mechanics. Either way my heals are useless.
Allene Pellingare is different. She jumps to a random group member and delivers a powerful blow, followed by a spinning AOE attack. If the 1st blow doesn't kill the DD, the 2nd attack will. This is where I can actively save someone by throwing a heal burst between the 2 attacks, AND IT FEELS GREAT.
(unless of course the 1st blow one shots them...heh)
I can reliably dodge roll her 1st blow when she jumps at me, so I'm pretty proud of that too.