That's not true at all. Even if you were to classify the logical fallacy as such most people do not agree with it. Here's a bit of an explanation: writing off all appeals to authority as logical fallacies makes no sense at all, some people are qualified to be appealed to.
Not Always a Fallacy
It is not always a fallacy to say that "So-and-so says that X is true, therefore X is probably true." For this discussion, it is necessary to distinguish between an expert and an authority.
If a famous astronomer says that the universeis expanding, then it is very likely that the universe really is expanding. If a qualified doctor says that a patient is suffering from Parkinson's disease, that's most likely the case. In these examples, the astronomer and the doctor are experts in a field, and are addressing topics within their area of expertise. As experts, they have studied their respective fields, are familiar with the state of the art, have studied how to recognize certain events, features or conditions, know how to recognize many problems that might lead a layman astray and how to work around them, and so forth. When we take an expert's word for something, we are saying, in effect, that if we had the time to learn as much about the field as the expert has, we would be able to examine the evidence and reach the same conclusion.
Naturally, this applies only to experts speakingwithin their field of expertise: there is no a priorireason to take an astronomer more seriously than anyone else on the subject of foreign policy or theology.
On the other hand, if the Pope says, ex cathedra, that contraception is a sin, then that's true as well. In this case, the Pope is an authority in matters of sin: it is his job to determine what is and isn't a sin in the Catholic church. In a very real sense, contraception is a sin not because it is intrinsically bad, or even because it contradicts the Bible in some way, but merely because the Pope has declared it to be so.
Note that in science, there are experts, but (ideally) no authorities.