I would have said: Thoreau was wrong; we can definitely get too much Nature. Witness New Jersey shore and New Orleans after hurricane, Japan after tsunami. So let's just use our heads for a moment. Thoreau could be gooey about Nature because he could walk home to pick up his clean laundry. My own personal Nature is the bird soundscape and blossomingatu cherry tree in my back yard, the sweeping No. Carolina hills I see on a walk with (domesticated) little dog. Beyond that," nature red in fang and claw"! Without constant pruning, mowing, and weeding, nature would turn my back yard into a mess! The snakes, the termites, and the wasps would overrun the place. Not to mention my own "nature"--an old body that would be dead already if not for un-natural interventions of antibiotics and surgeries.
That said, God has made a glorious earth: the South Pole, the rainforests,the smashing oceans. And I love what man has done with it up to a point. Especially Teddy Roosevelt, who started the National Parks to set aside some wildness for us. We humans in our own nature have profited from and pillaged Nature; if we don't get it together, Nature will take revenge. Perhaps our nemesis will be the death of the honeybee, a phenomenon of nature not understood and a potential cause or our natural extinction.