One of the lies that is often told to writers is that to write, you must have lots and lots of time. The reality is that pretty much nobody has lots and lots of time, so wannabe writers have to make do with 5- or 10-minute intervals here and there. If you are on a time crunch, sometimes the best thing you can do is freewrite, or just write whatever comes to mind, whether it’s good or bad or just a rant about how little time you have to actually do “real writing.”
Good ideas can come from freewriting. Many wannabe writers believe that good ideas will strike out of nowhere, and that does sometimes happen, but to attract more ideas, a writer actually has to, well, write. Then the muse is fully awakened and your subconscious (is that the same as the muse?) can work on more interesting ideas behind the scenes. So when you get a chance to freewrite, you may find that your stream of consciousness holds something valuable.
So don’t discredit freewriting as “not real writing.” Anything that can help you arrive at the next great idea is worth the time spent, even though that time may not be the idyllic (and envied) 2-hour stretch that many “real” writers claim to have.