I appreciate a few sitting logs around a fire pit and consider it as much a part of a campsite as the fire pit.  Other than that, I would just as soon not see cairns, constructed furniture and other 'improvements' in the wilderness.  I  once found a gosh-awful 'latrine pit' that someone constructed, complete with sitting logs and torn up moss and duff in a way that was in no way necessary and certainly outside of park rules.  I did my best to restore it to it's natural state and erase the ugliness it left.

pd