Much later, I did begin to think mostly in words, and (perhaps for unrelated reasons?) my thinking became much less efficient.
Also related, I experienced temporarily enhanced cognition while under the influence of entheogens. My thoughts, which normally fade within seconds, became stretched out, so that I could stack up to 7 layers of thought on top of each other and examine them simultaneously.
I remember feeling greatly diminished, mentally, once that ability went away.
What it seemed like subjectively though is that my thoughts themselves became "longer", imagine planks of wood. You can stack them (slightly offset, like a video timeline with layers), and the wider they are, the more ideas you can stack before it topples over.
I have unfortunately been unable to replicate the experience. There were after-effects for a few weeks where my senses and cognition were markedly enhanced, but this faded after a few weeks.
My main take-away here is "why are we trying to make machines smarter than humans, we should try to make humans smarter"! (I guess Neuralink kinda does that, but it doesn't actually make the human part smarter...)