Nourish absolutely need to have the hot requirement removed. No other heal has this. On my shaman, I don't have to worry about it at all and it improves quality of life so much. (in addition to the majority of my 'efficient' heal getting 30% haste).
Right now, Druids have the poorest AoE healing, and the poorest "snipe" healing., both Renew and riptide can be used more frequently than Rejuv.
The best role a druid can hold right now is MT Healing, IMO, with using wild growth when necessary. yes, you can do everything else too, but IMO, everyone can do it much better.