In my opinion, what makes "1984" so disturbingly effective is that one would like to think that this novel is science fiction, the "other world" that you speak of. But the reality of "Big Brother" technology and arguably the behavior of our politicians makes those concepts uncomfortably real.
Orwell writes of cameras watching citizens every move. This has come to pass. Just last month (3/07) a London newspaper reported that "Britain has a staggering 4.2 million CCTV cameras - one for every 14 people in the country - and 20 per cent of cameras globally. It has been calculated that each person is caught on camera an average of 300 times daily."
Orwell was apprehensive about government watchfulness way back in 1949. I have no doubt that even he could not envision just how much our privacy has been compromised.
Another thing you will notice as you read "1984" is how many of the sentences are very short. The clipped nature of the prose shows thoughts of the characters are truncated. They have learned to not reveal much at all.
The characters, of course, live in a world that is highly restrictive. Their every move is watched, even their thoughts. The people become ever more fearful and less individualistic. Here is an example from the opening chapter: The patrols did not matter, however. Only the Thought Police mattered.