If both parents truly support shared parenting the effort towards making that happen would be equal. Bashing the other parent or fearing the kids might like it there too much is not an equal effort. Doing what is best for the child is an equal effort.
12 Things to always remember. I can not emphasize enough how true this advice is! Wish I had listened to Wisdom when I was younger, would have made life a whole lot easier and less painful. It gets better (hugs)