Your analogy doesn't fit. The post was not intended to say that because Linux systems can require/be taken best advantage of by using the command line, that they are worthless as you imply. Instead, it says that the use of the command line is something that the majority of the computer using public doesn't care to deal with. That's not to say that the command line doesn't have advantages in any operating system for some tasks. Rather, that the majority of the public has learned to use a computer in one way, and at this point is not ready to transition from that.
So back to your car analogy, no, just because a car is stick does not make it worthless. It means that a large percentage of the population does not know how to drive a stick, and does not care to invest the time to learn, as their automatic car functions perfectly well for what they need it to do. Sure a stick might save them a bit fuel wise, or be more fun, but that doesn't mean its by default better for every situation.
Also, I suggest you're careful calling someone an idiot or incompetent just because of a lack of computer knowledge. I'm sure there are plenty of things you are not an expert in, but I'm sure you also wouldn't consider yourself incompetent.