To me the high elves is the most high fantasy race of the warhammer univere.
I see the WE as a very noble race, but their mastery over nature is not for everyone, and as such I would not say that a noble would with the wave of a hand produce a chair.
Rather, as old WHFRPG fluff say (in the Realms of Sorcery book where treesinging is described), it is only the treesingers (spellweavers) who are capable of forming the trees to do their bidding.
I also se the forest as a potentially malign presence (as presented in the WE novel 'whats-its-name-i-got-it-but-can't-remember') which the WE do not have perfect control over, especially in certain parts of the forest (for example the story about that special character Dryad 'what's-its-name' (Drycha?) who has essentially gone mad (or just very very angry at ANY 'invaders' of the forest including WE) so that even the WE fear her.
This is not a fulfulling describtion... but its some of my thoughts
