Try running content minimum item level, and see how healing and damage received will go.

Gear increases main stats, HP and defense. You can't have geared people taking the same damage as less geared people, and more geared healers casting the same mount of heals as non-geared healers. Intensive healing has its moments. The more people gear the less intensive it becomes, it is part of progression.

This game is a dps race, everyone is a dps (Including tanks and healers). Some people do not like this approach, others say it is what makes playing certain roles interesting for them. If you want the game to be healing heavy, they can always add more AoEs and TBs. But they need to adjust the enrage timer or increase dps potency to make up for the lack of dps from healers.

In some games, you start the fight with a nasty dot that deals damage to you. It keeps increasing throughout the fight and eventually kills you if you don't beat the content before it gets fully buffed. This is what usually kept healers busy back in old MMOs (Almagest is a close example) Even classes needed to mange their own self heals. "Your job is a healer and you'll be healing 90% of the time."

If you think about it. Keep healing and doing mechanics is much easier than knowing when to heal and when to dps while doing mechanics. Because in 1st case you're healing almost none stop it and less work on your brain. While as timing your heals + certain people that want to cheese mechanics need their own heals/shields + dps is more work on the healer.

And btw, healers keep fixing their rotation very often (Until they have BiS) unlike tanks and DPs. Because gear plays a big role for them. Their heals become stronger, people around them start taking less damage, they no longer have to cast 4 heals and reduced it to 2, and start focusing more on dealing damage. Also lets not forget crit Shields. I really don't understand when people say that playing healer role is boring.

I personally think that what we have now is far more interesting for healers. They can make them heal more and dps less (With more AoEs and TB like i said). But don't make them healing machines.