Healers that don't want to DPS are like DPSes who refuse to move out of AoEs.

[Kitfox]

For those using strawman and saying "but ignoring kit"- not all jobs use 100% of their kit. I don't see healers cure spamming cure 1 and 2 for cure procs. I don't see sch spamming adlo for hq procs. you don't see mnks in fists of the earth once they unlock fist of fire and i don't see them using pulling for haymaker. I rarely/never see drks use their dot on mobs, i rarely if ever see wars use their dots. I don't see ninjas using all of their ninjustu. I rarely see AST stance dance inbetween fights, or use their barrier skill in fights outside of primal/raid boss ultimate attacks.

WHMs uses Cure 1 all the time to proc freecures, otherwise they go out-of-MP very easily. Except in dungeons where mobs barely break through Regen.
SCHs spamming Adlo for a few tries to get a crit is very common. Especially for Deployment Tactics.
MNKs use their Fist of Earth in PvP and when they take heavy unavoidable damage. Haymaker is useful when attacking from the front, but usually only happens when solo or tanking an add.
DRKs definitely use their DoT on everything that lives for 30 seconds unless it's an AoE pull and Abyssal Drain is higher potency.
WARs most definitely use Fracture at least in Berserk rotation.
ASTs definitely use their Collective Unconscious even on regular dungeon pulls because the Regen is very potent. Stance dancing is useful in dungeons although not always possible due to CD timer.
NINs use all their Ninjutsu in PvE except for Hyoton, and it's still useful in PvP.

Just because you don't see people use something doesn't mean they shouldn't. Whether or not you should use something can determined by logic, math and risk evaluation. Many skills are situational, but that doesn't mean they shouldn't be used in the right conditions. It's true that some abilities are almost useless, but healer DPS spells are not among them.