When people love something very, very much, they really get into it.
Think of Doctor Who like a(n American) football team. Anybody can watch The New Orleans Saints (my team) play. They can enjoy the team and root for them. They might even have a t-shirt or two with the team's logo on it. However, they may not know (and don't care) who the coach (analogous to the showrunner) is. They may not know (and not care) even who the quarterback (analogous to The Doctor) is. They simply enjoy the game of football and they watch their team when they are on, but they don't delve any deeper and they aren't aware of personnel changes. They can even consider themselves fans. However, the hard-core fans, or, should I say fanatics, are those who know who the coach is (and his track record), know who the quarterback (and the back-up quarterback) is and his track record. We delve into the minutiae of the roster, the statistics and the players. Thus, in Doctor Who, we delve into the minutiae of the characters, the actors, the showrunners, the writers and the lore.
Is this healthy? Not necessarily. Is it any better to be a fanatic rather than just a fan? Not necessarily. Does it mean that we love the show any more or any more intensely? (I would argue yes, but, again,) not necessarily. However, it just is the way that some of us are.
The vast majority of people who watch Doctor Who are probably like yourself and they couldn't tell the showrunner from Adam. And that is a valid way to enjoy the show.
However, message board systems like this will attract a LOT more fanatics than fans and, thus, while you are in the majority of Doctor Who watchers overall, I think, you will probably find that on this board, your apathy places you in the minority. LOL!
(In other words, Adams said it better and more succinctly, but I just felt the need to add my post.)