I'm not convinced it's a fact we all think as differently as implied. Try and get a room full of people to even agree what "internal dialogue" means or whether you actually hear a voice when you recall it.
Can you express your internal monologue in words? If not then it is clearly not an internal monologue. I can't express mine in words, hence I am certain it isn't an internal monologue.
Similarly I doubt others would say they have an internal monologue if they couldn't express it in words. Hence I am fairly certain that they think in a different way, or at least they think they do.
