Orwell describes how language can affect thought. The essay is full of examples about how vague expressions convey much more unclear meanings than "simple" expressions, and how frequently used phrases can even do the thinking for you.
I believe what Orwell is talking about is true for more than just politics and for more than just the English language. Fictional and non-fictional writings are also suffering from the use of bad language. The two languages that I speak
fluently (i.e. Armenian and Arabic) also suffer from needless metaphors and vague expressions.
I think this essay should have been called "Language and Thought." It will appeal to those who have interest in linguistics and "know what they are talking about".