I actually wish there were more of these people around, since this is exactly the gap that needs to be filled in modern medicine. You can hardly blame doctors for not keeping up with their patients when they already have so much on their plate and nurses rarely even get the chance to develop a long term relationship with particular patients.
So, all a doctor can do is recommend that a patient follow a particular course, but even the best doctors might not have the time or even the skills to follow that up (for example, by guiding a patient into finding the right therapist).
A patient care coordinator would be able to develop personal relationships with the patients and take care of all the specialized administration tasks that often fall on the patient or on their family and friends (and often don't happen, as a result.).