>An inner voice or inner monologue as you describe isn't necessarily a good thing
Bingo. Language is a creation of the human world, and not natural to our cognition, so when we spend the mental resources to translate our thoughts into language we are limiting our capacity to process information both by the available words (defined by people who are not you) and by the cadence of your inner voice. When you access your internal realm through more natural methods you can experience cognitive processes which may not be possible if you're limited by language.