I'm actually doing tree-hugging right now mostly as an aid to aikido practice. Learnings so far:
It's like zazen for the body. Just as in zazen the first thing you learn is that your mind can't be quiet for five seconds without hareing off on "commentary trips", I'm finding my body can't be quiet for five seconds without tensing up somewhere. The layers of tension I carry without being aware are phenomenal.
Correlation is not causation, but starting standing meditation has been associated with some major, and rather uncomfortable, personal and life insights.
Anyway, I think I'm getting a lot of value out of it, at least for now.