Damage/healing comes from sooo many different sources that nothing really feels that powerful. For instance my holy priest, renew in itself does close to nothing on its own, you kinda have to keep it up for 10% increased healing on targets with it up, then there is some heal proc when PoM heals target with renew on and there is another one stat stacks as renew ticks.
Kinda prefrred it when you wanted to cast renew just because it was just a nice HoT on its own. That theme is present all over other classes, not saying that "vanilla style" where you pressed just one or two buttons was ideal, but since wrath pretty much every class had a solid rotation/priority and it still felt really good when you just saw that juicy WW crits on warrior, where now ww is just a tool to activate warriors cleave.