If you were more aware of what was out in nature, and studied it, you would begin to see a lot of patterns. But since you don't really know anything about it, I think you react to it more out of fear, and it makes you uncomfortable. I'm not saying you have to like it...in fact quite a lot of people DON'T like being out in nature. And a lot of people don't have any desire to learn about it or study it, which is fine; but that would be why they think it's scary or unpredictable or chaotic. Not that there isn't an element of unpredictability (but that's part of Life - wherever you are), but I see the unpredictability as inherent in nature -- thus it becomes predictable to me. ;-)
I think planned gardens are 'pretty'; in fact I've been to some parks/arboretums, and they're pleasant. There's an arboretum near where I live, and I actually love going to it several times a year and walking around, and seeing different flowers from week to week -- a lot of knowledge and careful planning was needed to create the gardens. I don't NOT like them. I can see why you like them. But..they can be created anywhere, at any time. You can't just create a forest or marsh or [living] desert at the snap of your fingers. And that would be why I like 'wild growing plants' more than planned gardens. For the complexity that cannot be recreated by people - a complexity that if you know your environment, will not 'surprise' you, but that all ties together.