Yes, I know it well. The way you describe daydreaming that you're showing people the things that you do, or explaining to someone why something means so much to you, particularly. Sometimes it's a particular person that I'm imagining describing things to, other times just an anonymous person or people. It's not "scripting" for a certain situation that I think I'll find myself in (though I do that too), and not the same as giving myself a pep-talk (which I also do a lot.) I can spend hours doing this, and it's mostly what my mind does when I'm lying awake unable to sleep, too.
I don't think it's "wrong" in any moral sense, especially as I find it very hard to stop once I've started, and can slip into it without realising that it's starting. But it is "maladaptive", in that it distracts me from actually getting things done, makes me zone out from conversations, etc. And it is "harmful" in that there are sometimes bad consequences for not getting things done, for not paying being able to pay attention to what other people are saying and doing, or for being forgetful when I'm trying to do a task (e.g. daydreaming while shopping, and forgetting to buy something that I really needed.)
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When you are fighting an invisible monster, first throw a bucket of paint over it.