as affiniti said, these changes just stopped you stacking resto druids in mythic (which would've happened had nothing changed).
both germination + rampant growth needed nerfs, they were far too strong (as lvl 100 talents) compared to other lvl 100 talents from other healing specs.
rejuv/renew both needed nerfs because an instant, spammable (cheap, 0 cd), high hps/hpm heal is broken in a world where blizzard wants healers to deal with damage over time, rather than instantly.
but really let me ask, are any resto druids actually surprised they got nerfed? lol
the only shocking thing i can see is that tranquility is still god tier compared to every other raid CD. if i had my way i would make tranq unaffected by +% healing bonuses (hotw, harmony, etc): i say this because in mythic raid testing i was able to achieve 42% mastery, which means on top of hotw my tranq was healing for an additional 77%~. that's completely nuts.