Is the "healing portion" of healers hitting a wall in EW?

[Silver-Strider]

Healers have more to manage than a single button though. We DPS most of the time but you still need to heal with oGCDs.

That's literally no different to any other role using their oGCD skills between their rotations.
It's like saying that Tanks can't have more than 1 button because they need to manage their mitigation CDs.
If a WAR is able to manage their rotation and keep a party of 3 DPS alive with the small handful of oGCDs they have that heal/shield party members, there is literally no reason the same courtesy can't be extended to healers.