Just sit there in silence whilst you cogitate.

this is the move

Space fillers are sadly important for group settings where you need to finish a thought before someone interjects.

But hearing them from an interviewee drives me crazy, along with "sort of", "kind of", etc. I once counted all of the "sorta"s in an NPR interview, it was brutal.

"Ummm, I think I agree with this description" vs "I, think, umm, I agree with, umm, this description"

The first one indicates something along the lines of "thinking, please stand by". The second one is a struggle.