... you're referencing a fabled myth as the prime source of a philosophical position?
Why not realize what you are? Exercising judgment on the entire human condition in how it relates to the well being of the entire species of people - is a fools errand. You will never ever be able to make anything out of it. So why even think along these lines?
In response to the direct question - No. Human beings are not sheep, never have been, and never will be. Recognizing what one is is part of the spiritual path. In the taoist view - devolving into animals is the reversal of evolution.
Ignorance is not bliss. People who say that, have never experienced actual spiritual bliss. Ignorance is a cause of suffering/disempowerment of people in the world, not it's answer.