At my course (built in 2000), two young trees were specifically planted in 2 areas (1 each) where way off line shot on the inside of the dogleg was somewhat rewarded (one is a dogleg right, one is a dogleg left). I don't know if the architect (Fazio) was consulted or not, but when they do grow, those trees will be in play (too small now). Both trees are not visible from the tree, but are in areas where if you hadn't played there before, you would think that you ball might be lost, but actually put you in a better position that the intended line off the tee. One note is that trees are really not in play on most of the golf course, excpet for a couple of singular trees that were incorprated into the strategy of a couple of holes.
I wonder whether a bunker in the same area would have been a better alternative. I'm not really sure..