The written culture always sets itself apart from the oral culture. Written culture is equated in universally made subliminal judgment with high status and admired quality. Remember or observe that prolonged immersion in one culture or the other affects a writer's entire outlook. Assigned readings and written reports inculcate structure and factual awareness. Effective speaking often requires a high tempo.
Effective writing is more a matter of selecting and positioning than of uttering.
It is hard to say whether movies are in the oral culture or the written culture or both. Movies begin with a script proposal and must acquire a script before actors are chosen. The next time you see a movie you like, ask yourself what was in the writing that helped you like it.