[garvield]

Image manipulation, game engines, graphics, finite element analysis, fluid dynamics, signal processing, weather models, etc. It's used everywhere where you have a system of equations to solve numerically.

Most of the industries are dominated by subject matter experts who write code.

[singhrac]

Significantly used in finance as well, risk estimation is often approximately fitting an MVN to sparse data. I’ve used ideas from this blog many times.

[commandlinefan]

Comes up quite a bit in the AI space as well.