To me parenting together or co-parenting or whatever you want to call is not that hard but as JRuss indicated being detached makes it easier.
I don't contact my XW for anything outside of stuff related to the kids. We have a Google calendar established with all of their activities on it so when it is your week to have them we both know where they need to be. The only conversation I have with my XW during the week might be something related to school or some other random question that may come up. Other than that I see her for about 5 min during kid drop off, exchange some minimal pleasantries and out the door I go. Sometimes I even meet her in the driveway and she doesn't even have to get out of the car it is the quick.
