Makefiles are great for automating builds, installs and tests.
But, that is not the end of Make. I have used makefiles to do many tasks like cleaning up logs, keeping mirrored web pages and downloads, hooked them into crontabs and test suites...
Like scripting, I think there is a large scope of automating with Makefiles. Particularly when you have a chain of dependency based triggering required.
What different things have you done using Makefiles?
What are you planning to do more with them, on a rainy day perhaps.