And I, too! After discovering Autofac, I've not looked back. Before, I'd tried various DI frameworks, and always left thinking "I totally do not get what why people like this DI stuff". Then, Autofac. Everything just works. But - it's also powerful enough that if I need to do something really clever and/or complex, I can, and it invariably works.

It works just as well in Core. As such, it's usually the first package I install in a new Core project.