Being in that situation, two things that stand out are: when thinking about a topic, I do sometimes formulate my questions or hypotheses in internal words, but the "answers" come back in non verbal form: for instance I suddenly just "know" where the flaw in the argument is, or what (counter)example I need to think more about. The other striking fact is that when I am very emotional (eg angry), the internal monologue is suddenly very vivid :)

Language is a crutch for thinking.

It's good to be able to think, regardless of the need for words to do so, but even wordy thinkers do lots of things without word thinking.

Like juggling. Or playing an instrument.

Just because something is done in a way that they don't do it doesn't mean it's weird to be done that way.