Most definitely. It's like this, with the exception of the C outer area, if you can be there without talking to anyone, the controller has no more authority to tell you what to do if you happen to be talking to him as if you aren't. Most of the time a controller's suggestions under flight following are beneficial for the pilot, sometimes they are only to the benefit of the controller and costly to the pilot. If a controller is about to waste $30 of my fuel for no good cause I can see, it's not gonna happen. If I have a target I need to make and they are going to interfere with that, it's not gonna happen. If it's no big skin off my back, no worries, it'll happen.