I run a healplar and love going as a duo. I can readily adjust the heals/support/damage as if almost on a scale. With notice and touch of reslotting, even more so.

If I'm doing a WB with a sturdy DK tank, I can get him within my aura and keep him under 3 HoTs, feed him stamina, touch up with Healing Springs as necessary and because a tank makes things pretty safe and predictable, work a moderate amount of damage into things - including the destro ult a couple times.

If, I'm supporting a ranged mage or archer, then I buff up and dive into the boss to try and hold him by being in his face - the foundation of that is Channeled Focus + Sweeps, augmented by my other skills as time allows and, again, that destro ult a couple times. What I'm counting on here is keeping the ranged player safe so they can augment my damage.

I also play a bow/bow stamsorc and would love to have my own healplar in support of her. So yeah, a good healplar can comfortably adjust to support almost anything and most healers 'think' in terms of reactive support based on what is needed.