Where do you live? My experiences are in NY and Oregon. We have a few places like you describe. But the vast majority are mom and pop courses where they carve out a little space for a hole and leave the rest untouched. The on closest to me is surrounded by houses, so some of the trees they have are really old. Would have been cleared for housing if not for the course. So it is almost like an oasis for wildlife. Though obviously it is on the high end side for sure, it still preserves some natural space that acts as a way point for larger stuff moving through the area from the undeveloped land not too far by. Thier ecosystem isn't impressive, but still plenty of small stuff for the ducks that stop by continuously.