That is a great point. But having something on the tip of your tongue is also one of the most frustrating exercises in thinking. It feels incomplete. I have often wondered, however, if we could develop an internal symbol set that was not constrained by time to speed up thinking. By "constrained by time" I mean that words, being serialized sound pressure levels necessarily take time to utter and thus to think.

Since viseospacial reasoning can happen much faster it gives me hope that it is somewhat possible.