A little moisture or mist on the camera won't make much difference. There is some weather protection on the D7000. The weak points are going to be the buttons and controls. For example, the buttons are small rubber disks with a raised center. As long as you have just a little moisture, it won't get through the seal, but any pressure forcing water under the flap is a problem.
With your lenses there are two problems. The front element or filter can gather drops of water - and a lens hood is a big help in avoiding droplets. I also use a lens cap between images with blowing mist or fog. Zoom lenses and lenses that extend when they focus pose a different problem. These lenses can collect water on the extended part of the barrel, and it can be carried into the lens interior. Be very careful not to let water get inside your lens - and use drying techniques and warm air to dry lenses thoroughly to prevent fungus.
What all this means is you need to provide shelter and use absorbency as a backup. The starting point is to minimize the amount of water your camera is exposed to from rain or mist. A little rain might be ignored - but if you are out in that rain for half an hour or more, it could be a problem. A hard rain needs serious protection - and you probably are not shooting in hard rain. And mist is just the same as light rain - except it often is blown by the wind. Protection starts with an umbrella or cover for your camera and increases depending on the amount of water.
Products like a the Vortex Storm Jacket cover your camera while allowing access. The Think Tank Hydrophobia is a higher cost alternative providing more protection. Some products not only cover your camera and lens, but also provide access for a flash.
Finally - water will get on your camera. When it gets on your camera or lens, try to blot with an absorbent material rather than wiping off water. I carry a couple of small absorbent towels from REI in my camera bag for this issue. I also carry a small lens cloth in a holder clipped to my camera strap.
Generally speaking, I would readily use the camera in fog or mist and not worry too much. If you are out a long time, a small towel to blot water will be useful. I would try to avoid too much rain, but if you plan to shoot in the rain you'll need something like the Storm Jacket. I keep a Medium Storm Jacket clipped to my camera pack at all times. If you get too much rain, it's hard to take good photos anyway.