Looking up how to do something, as an improved stackoverflow. Especially if it provides sources in the answer.

Boilerplate unit tests. Yes, yes, I know - use parametrized test, but it's often not practical.

Mass refactoring. This is tricky because you need to thoroughly review it, but it saves you annoying typing.

I'm sure there's more, it's far from useless. But you need to know what you want it to do and how to check if done correctly.