Just one person's opinion here, but I prefer to WATCH courses that either A) have a mix of open/wooded shots, or B) are only lightly to moderately wooded.
Of tourneys I have watched, Idlewild is by far my favorite. It has everything. Short technical shots, water shots, open bomber holes, sharp turns right and left, roller opportunities, elevation changes, open to wooded greens, wooded tees to open greens, etc. I think its the variety that I love to spectate (and play, though I am horrible at it).
Maple Hill is a close second, though one complaint is there are not many major doglegs. But for scenery, and good mix, it certainly has that.
Even though I would classify as open to lightly wooded, I also really enjoy watching DGLO, because that course is so challenging, and there are still plenty of woods to contend with if you get off the fairways. Nasty, disc-losing woods.
If we are going to have the really big tourneys at the same courses every year, it would be nice if the course itself offered good variety.