Putting aside pvp and end game content, the nerf hurts massively for levelling/questing.
The issue isnt the damage reduction, the issue is the fact that we are now being told to make up for it by using a skill that only becomes viable once you get Eclipse rune, and then… the rune is glitched and doesnt prevent spell cast knockback like it states it should.
Once we are level 40, most of us PVE druid casters will end up going resto where a dps nerf doesnt affect us much (yes, our damage numbers will be lower, but that isnt our main reason for being there) and with a bit of further tuning such as buffs to other skills, and improved mana management, Balance could be in a better situation and be competitive on DPS again too, but as it stands, its the levellers who have been hurt the most.
I know blizzard dont read this forums, but for the sake of caster druids, please fix Eclipse as a matter of urgency.