How would you solve the boring "damage rotation" of the healers?

[Nizzi]

And if the encounter design was better, healers wouldn't require a complex DPS rotation. We would be busy throughout the fight providing healing/mitigation/support. Instead, it's DPS..... heal in between.

Hmm, well I've done DSR on Scholar and that's a very pressing and busy fight that requires a lot of GCD shield casts, and the "simple DPS rotation" is still boring as sin, so...? It sounds to me like you just have an insanely unrealistic expectation of the amount of GCD healing this game should/could have.