Well, it depends on your opinion of where a plant stops being a bush and starts being a tree. Some of those gorse bushes especially those to the left of #10 are pretty damn big, and a hell of a lot worse than just about any trees of any size.
TOC may not have any true trees, but its got a wider variety of hazards that just about anything else. You've got the burn, bunkers galore, a fair bit of gorse, OB that includes multi-acre putting greens populated by children and old ladies, driving ranges, hotels, rows of parked cars and city streets.