Yep, I notice this sometimes when other people are doing it. I don't notice myself doing it, but that's probably because it's easier to notice from the receiving end.
In writing, it makes me bounce off. (There are many posts competing for my attention, so if the first few sentences fail to say anything interesting, my brain assumes that your post is not competitive and moves on.) In speech, it makes me get frustrated with the speaker. If it's in speech and it's an interruption, that's especially bad, because it's displacing working memory from whatever I was doing before.
In light of reading through Raemon's shortform feed, I'm making my own. Here will be smaller ideas that are on my mind.