The melody is deliberately trite. The song is a satire--it isn't supposed to be nice--it is supposed to use the razor of wit to expose the truth.

And yes,, doctors, lawyers, and business executives have become cookie-cuttered commodities. You and I know that they are human beings (actually that, "We are human beings"), and Malvina Reynolds knew it too, and that was her whole point--the machine that pounds out cookie cutter houses does exactly the same thing to people.