There is more to saying “uh” and “um” than you think. To be fair, most of you probably never think about these conversational mitigations at all, so that’s not saying much.
My favorite bit is that an “uh” causes no excess delay, and the actual delay is only due to “processing problems.”
I find myself having processing problems on a continual basis. Now I know my brain’s pinwheeling has a sound.