We use it to automatically instrument code for tracing. Stuff like this is IMO the only acceptable use to reduce boiler-plate but quickly becomes terrible if you don't pay attention.

Also good for having default activities performed on object or subsystem. For instance, by default, always having an object have security checks to make sure it has permission to perform the tasks it should be (have seen this, and sounds like a good idea at least). And also, to have some basic logging performed to show when you've entered and left function calls. It's easy to forget to add these to a function, especially with large codebase with lots of developers