It doesn't get better because of scaling making healing meaningless after 50 until like 80 but only for none warriors and then later only tank that needs healing is DRK.
It's weird because 16-50 dungeons require tanks to be heal then at some point in HW both PLD and WAR just get super strong self sustain.
This is part of the reason why people want healers to have more engaging DPS, running anything old and anything in a solo scenario is painfully boring.