"Creatives" don't use LLMs when they work on creative things. They use them because the people who employ them saying "AI is the future" and humans are just expensive meat that gets in the way.
Almost everyone in film making that's entirely finance/business end of things is an artist or at least a crafter/technician. Actors, set work, costume work, lighting, sound, weapon making, vehicles, stunts, visual FX, editing .. Watch the f-king credits of any film, even the low budget stuff and you see lots and lots of people involved. I've watched gen-AI movies (short ones) being made, and there's very little art to it. Building enormous prompts that make a statistical algorithm behave the way you want is tedious, time consuming and not very rewarding to artists. There's a huge difference between getting a kick out of chatbots and making art.
It's kind of like how the intersection of sports fans and people with gambling and addiction problems is large. The dopamine scrollers and addicts might get a kick out of AI prompting.