I played a modest course yesterday, Wildwood in New Jersey.
#8 had OB beyond a line of trees on the left. It was 400 yards. Just before the green (30 yards+/-)the trees on the right came out to cover a small portion of the green from a straight shot from the right side of the fairway. There was a bunker left of the green but none on the right. The green had a gentle slope from back left to front right.
What I liked was that
#1 the OB gets you to favor the right side on your drive
#2 there was no bunker right which would have been like a double hazard
#3 the slope of the green that helped hold the well hit shot from the right, but would repel the left to right shot.
Finally, I think the group of trees was a better idea then just a single tree , because it would not ruin the stategy if one or two trees died.
I did find another reason that I don't like thick lines of trees between parallel fairways. If one misses the fairway by ten yards they have no shot but if they miss wildly they have a shot.
Would a designer intentionally punish the slight mishit so much more then the significantly off line one ?