Name three courses that follow your answer well and three courses that follow your answer poorly. On linkslands they play none, on parkland they usually play more, but I think it is overdone. The occasional overhanging hardwood on the inside of a dogleg is tolerable once a round, but never more, and only if there is room around it to play. Trees with memorial tree-planting programs are hopeless. Clubs that trim their trees back are flailing at the wind.
Wholesale removal is the only way to go.
Winged Foot-West Course , Westchester, NY is a travesty of Tillinghast's original design because of the reckless tree plantings, esp. of conifers, that block out hazards, both visually and structurally. Chicago, Ilinois is another over-treed golf course. In this case, trees didn't overrun a great golf course. It was the proliferation of trees in the first place which masked the fact that the golf course was stunningly mediocre in the first place. Oakmont , Pittsburgh, Penn. got it right - after random plantings in the 1950's and 60's, they just removed 1,400 trees, and got the course back to its basic ground features.