We all aim to be as agile as possible in today’s fast-paced web design world, while also remaining thoughtful of the end user and those we work with. After Effects is a great tool that enables us to quickly visualize and test robust animation patterns throughout a web design, share those with the development team and clients, and even test variants with users to get quick validation on a design before it goes into production.
Source: Fitting After Effects Into A UX Workflow