Druids are all about the forms they turn into. So humanoid appearance just looks like a non-druid thing on WoW.
I used to enjoy more Resto build before these changes, although I've been always a Boomkin, when we could turn into treants.
I've been thinking on possibilities to combine both ideas of permanent form of treant, and the new empowered ToL form.
Could be something like, you shapeshift into treant to get a few and minimal benefits on healing done. More like be in ToL form to get 25% more healing.
And then an empowered ToL, or
Ancient of Life like someone has suggested, to take the form of new ToL skin; bigger than a treant and somehow more resembling to a tree or Ancient. Which could get all benefits from the current ToL. The different however could be a mechanic applied to it, like:
When on AoL, the caster entangles its roots into the ground to withdraw powers of the nature, empowering some of his/her nature abilities. But increases the range of all nature spells in 30%.
Then the Treant Glyph could be turned into,
remove the rooting effect of AoL but doesn't increases its range no more.
Just a few ideas to spread out.