Druids are pretty decent at healing there are a couple things I would like.
1) Bring Swiftmend & Wildgrowths cooldowns closer together, so you can always gain the benefit of SotF to use with wildgrowth with no waiting.
2) Make Force of Nature 'smarter ai' I think they should be able to walk/ move and cast at the same time, healing should be scaled to be competitive with that tier.
3) Cenarion Ward make it 'smarter' something reminesent of Earth shield for shamans.
4) Mushrooms.. honestly i've seen creative posts on how to fix them, I guess blizzard thinks they are 'working as intended'. Wouldn't mind a minor glyph to make them look like wild flowers.