To my knowledge, Neil Postman has never given an official statement on what he thinks of Amused to Death, but in his book, "The End of Education", he does directly refer to Roger Waters and Amused to Death. The following is taken out of a chapter concering museums and the appreciate of classical art forms:
There are, as we know, different levels of sensibility. In the case of music, for example, most American students are well tuned to respond with feeling, critical intelligence, and considerable attention to forms of popular music, but are not prepared to feel or even experience the music of Haydn, Bach, or Mozart; that is to say, their hearts are closed, or partially closed, to the canon of Western music. I am not about to launch into a screed against rock, metal, rap, and other forms of teenage music. In fact, readers should know that Roger Waters, once the lead singer of Pink Floyd, was sufficiently inspired by a book of mine to produce a CD called Amused to Death. This fact so elevated my prestige among undergraduates that I am hardly in a position to repudiate him or his kind of music. Nor do I have the inclination for any other reason. Nonetheless, the level of sensibility required to appreciate the music of Roger Waters is both different and lower than what is required to appreciate, let us say, a Chopin étude.