Joe Hancock
that is an interesting point.
perhaps we have 4 golf course models,
1. tree lined fairways
2. bunker lined fairways
3. housing/out of bounds lined fairways
4. water lined fairways
with some courses alternating between these features.
And, then we have golf courses with occasional fairway hazards.
A single strategic tree (or a group of three or five) can be a good feature.
As Tom Doak noted in his 'Anatomy of a Golf Course, trees are not permanent, ie they grow taller over time, and then die. It depends how critical an individual tree is to the strategy of a hole as to whether it works well over a longer period.
At my home course (Royal Adelaide) I can think of three situations where trees come into play.
On the short par 4 third, a badly out of position shot has to play under/over a tree, or may be blocked out.
On the shortish par 4 eighth, trees block the left side of fairway and must be carried.
On the long par 4 14th, trees defend the left side of green for a second shot from the left. previously, a very heavily set tree blocked the view here, but that tree was damaged by a storm at Christmas time, revealing a more open canopy tree or two some 40 yards before the green.
I think the use of trees (and all other forms of hazards) is about balance - too much of anything is not a good thing.
James B