We just returned from two nights at Codorus. We stayed at two different sites in the A loop, #18 and #31. Both were very shaded and large. There is a lot of space between most of the A loop sites which we prefer.
A loop is non electric sites and has a nice, clean bath house with warm showers.
The playground is over between the C and D loops, a pretty long walk from A loop which is the only real downside for my son and me.