Editing audio interviews for podcast I sometimes remove lots of "particles" as the author calls them (I just call them "ums and ahs"), TFA poses a question. Do particles have "meaning"? Don't think I ever heard a discussion of that in any linguistics class, but they do have an effect. Working in radio/podcast you get quite a deep feel for speech as more than just words.

I've heard there are effective "de-um" plugins, but I prefer to work with them by hand because they create non-verbal signals, mood, excitement, confidence or lack of confidence about a statement. So often I decide to leave them in. They can signal relations between multiple interviewees, like deference or conversational leadership. Some speakers are impossible to 'de-um' as it's so woven into their speech.