I use deep litter in my 10x12 layer barn which houses 25 birds. To me it is a no brainer. I totally clean my coops 2x a year, in fall and in spring. All the shavings go into my compost pile. When I add all the fluffy new pine shavings, I also add leaf litter, small sticks, wood chips from my wood splitting area, grass and shrub clippings, and any other organic debris I find around. My thinking is this keeps the girls scratching a bit for green goodies and also promotes composting when the bedding eventually makes it to the compost pile.
I will often throw treats under the roost bars when the poop is piling up to get the chickens to turn that area thoroughly for me. Some people think that is gross but the chickens don't seem to mind so I call it smart! As needed, which varies based on weather (wetness, amount of time spent inside coop etc.), I will add a whole new bag of shavings to the 10x12 coop. This occurs approximately every 1.5 months. I just throw it on top, add treats, and the chickens do the rest.
I LOVE the deep litter method. My chicken chores daily, with my automatic door and large capacity feeders and waterer, consist of collecting eggs and enjoying my girls. None of my daily chores involve poop. This gives me more time to just enjoy my birds. This has been my first winter with deep litter where my birds are inside a majority of the time. I was worried about cleanliness. But other than slightly dirtier feet, the smell of the coop and the cleanliness of eggs has not been effected. Everyone is happy and healthy.