Ukramedia covers the similarities of working with Drivers in Blender, like writing expressions in Ae.
Ukramedia’s Sergei Prokhnevskiy shows how you can write expressions in Blender like you can if you work in After Effects. Sergei shows how you can use Drivers in Blender to write expressions much like you can in Ae.
Usually, when one thinks of Drivers, they immediately think of rigging tasks. However, drivers are helpful for more functions than just character rigs. One suggestion showed how to control attributes in more than one material using only one control.