I just recently started playing healer and i like it, its more proactive role in comparison to any other healers in other games i used to heal in (neverwinter, ESO).

On my low lvl WHM i try to apply dots to all mobs around the tank and heals him along with taking off debuffs from him with esuna and actually i find it more engaging than playing a tank.

You may not value the DPS you are able to dish out as a healer or think its unnecessary, BUT I DO see its importance and i could see now the difference between groups in which healer does dps and does not, healers do bring a lot of value to the party with their DPS making the run much easier and cleaner that i will tell you.
It feels several levels better than healing in ESO where you could meet people with no idea how to play at all, it could make your dungeon as long as 1 hour in that game if you play with wrong people which is frustrating beyond anything you will ever experience in ffxiv.