I think the argument is more that
if actual DPS rotations are deemed boring, then there's no hope of making healer DPS rotations not-boring. And at some level, I agree with that.
What do I do for this GCD?
The DPS and Tank answer is always the same: push a damage button. And the entire point of a
rotation is that there's not even a choice
which damage button it is. It's already been chosen by the rotation; you need only do the right thing.
Healers, in theory, might have to choose between pushing a damage button vs. a healing button. In practice, depending on the content you're running, the answer is very lopsided, and within those two answers (damage or healing), the choices are limited/obvious.
Hence my previous response.