Back in school I was diagnosed as exceptionally gifted / learning disabled. So I am probably an extreme outlier, but I don't think of myself as the voice in my head. The voice is stuck with language which is this huge, unwieldy instrument, that's far too slow to be interesting. If feels like there are separate machines that can preplan how to move my body, solve math problems, play a video game, etc. Still composing this sentence feels more like remembering the words that best fit the idea, while scrabbling to find the next word to fill out the logical sequence.
Anyway, the best analogy for who I am might be the entity that decides which ideas are terrible and which ones are reasonable enough to keep. But, I don’t hear other people talking about themselves like this, so I wonder if there is all that much commonality. When there are so many ways solve a programming problem why assume that everyone is wired up the same way. Considering all the crazy people out there and how people can function with significant brain damage, there is probably a wide range of internal landscapes even among normal seeming people.
PS: Consider how many different ways people you know react to alcohol a simple drug and then consider love as a huge cascade of chemical responses. Do you really think all of humanity reacts the same way internally?