Animations and explainer videos help get ideas across quickly, and animated typography is great for title sequences and spicing up video in general.
We live in a graphically designed world. With logos, posters, flyers, and advertisements of all kinds, nice design helps your ideas compete for attention.
Starting with a pencil or photo reference and working out a stylized design can also be useful for branding and messaging.
Sometimes a fun video montage supporting a product, brand, or event can create the impact a message needs.