Most of the ones I have played have already been mentioned...Harbour Town, Muirfield Village, Spyglass Hills, Forest Highlands. Most of Castle Pines is forested, especially on the back nine. I'm not sure what it was like originally, but seems like The Golf Club has a lot of old mature trees through much of the course, maybe not enough to call it a forest. Ditto Point O'Woods. Sahalee certainly is forested, but as much as I do tend to like trees I thought it was too claustrophobic for my liking.
Did they have to clear trees to build most of the River Course at Blackwolf Run? The Meadow Valleys portion appeared to have been open, but the River seems pretty forested around the perimeter of the course.