Don't forget the objective wheel also points to secondary objectives such as capping CP's (which I believe are in random locations), blowing up shortcuts etc. I'm pretty sure not all of that shows up on the mini map
As I said, you will stop using the objective wheel because your learn the maps. You know where those CP's (No they are not random) are, you know where these shortcuts are, you do not need the objective wheel to tell you that again.
You will take CP's without thinking about it, destroy shortcuts and what not they might put up.
Objective wheel is there to help you when you feel lost, when you learn the maps I think that you will start noticing that your usage of the objective wheel will be less and less.