I just fillet them. Lots of good recipes for the Breast meat.
For the legs and thighs I crockpot them on low in chicken broth/water for 8 hours, let em cool and shred the meat. I use it in Chili, and my new favorite Enchilada's.
For the wings, I take out the bones for call making. Used to take out the primaries for fletching.
Not much waste but the rest gets fed to the wild critters out back.