For example, Casting Flash Heal or Heal (Cure1/2) reduces the CD on Power Word Serenity (Tetra). Casting Smite (Glare) reduces the CD on Power Word Chastise (1min CD damage with a stun, we don't have an equivalent). Casting Prayer of Healing (kinda like a targetted Medica1, but a lot weaker) or Renew (Regen) reduces the CD on Power Word Sanctify (ground targetted Cure3, bit of an odd one).
But then the real depth in the WOW version of the system is how there's synergies on top of those interactions. Cosmic Ripple is a talent that causes an Assize-like burst of healing emit from you whenever the CD on PW Serenity or PW Sanctify finishes, incentivizing you to keep using them, and then using the things that make them come back faster. Empyrean Blaze causes your Chastise to empower your Holy Fire (a second, 7s long super-strong DOT) to skip its 10s CD and allows it to stack multiple times on the same enemy, allowing you to deal good burst damage with it (if it's safe to spend GCDs on applying it). Revitalizing Prayers causes Prayer of Healing (the scuffed Cure3) to have a chance to also apply Regen to the allies it hits, and those extra Regen procs also count as 'casts' so they also trigger the CDR on Sanctify.
And the biggest one is Power Word Salvation, a TWELVE minute CD that, in FF terms, heals like a Medica1, applies 2 stacks of Excogitation and one stack of Regen, and does this to the entire raid (eg in an Alliance Raid it'd hit all 24 players). Each time you use Power Word Serenity or Sanctify, the CD of Salvation is reduced by 15s. So it's a CDR system on top of a CDR system, and this means that the CD is effectively closer to 4min rather than the full 12min. But because the action has such a long native CD, it's allowed to have such a crazy sounding effect, which increases how impactful it feels when you do use it.