I really do wonder sometimes if all the flashy aoe's are just a way to artificially nail players, thus making healers more required to heal. I am a casual though, so I'm not talking about a well oiled machine, like a static party... but rather parties that aren't always on the same page on new content. Instead of focusing the meanchics and gameplay so that the bosses are naturally difficult, we're greeted with just surface layer "toe was barely touching the aoe" vul stack nonsense which has gotten worse over the years. The game is strangely both mindlessly simple, but also incredibly unforgiving for those with latacy and lag spikes, or those who had trouble before the new graphics update (like myself), who now have an even worse time staying out of "bad" because of it...
We can't afford to lose healers, but you hit the nail on the head that there is no skill based value in being a healer. It is a foundational issue in the game that I could say for just about every class. Yes DPS is highly valued because we won't kill the enemy otherwise, but I would very deeply argue the level at which that value can be measured has decreased drastically by the job gutting and modernization under the idea of "jobs for all" as the devs would view it... I don't want jobs accessible for all. I want jobs finely tuned so that a player entering into that job zeroes in on that job in a pragmatic and realized way. Our mains are our mains for a reason, after all.
I recall a time when being a good dragoon (not the floor tank) made a player highly prized due to positional attacks and the rotation of those attacks being somewhat difficult. There was a very real skill involved in being a good dragoon. It was not easily achievable, hence the run-on floor tank joke. I loved my DRG very deeply because it was my main, I learned it, struggled and achieved.
I felt the same for my old WHM. I miss that WHM. Healing is no less difficult for me dispite their "improvements", in fact I'd say they actually made it harder in some respects... but without the "feel good" feeling of accomplishment after the instance is over... I miss that feeling... for now Pictomancer offers that, but I know its day for getting gutted will come... and it will be a sad day indeed.