I'm sure Intellij is very nice with refactors that just push code around. Renaming or extracting a method in an automated way should obviously maintain working state.

But I'm not religious about TDD. I might try different ways to modularize the same code or sketch out several different interfaces or service stubs. This is not something that you can automate.

And when I'm done laying out the major pieces, the problems view in Eclipse helps me climb out of the sea of red that I've created by pointing out where I need to wire up methods together, or think more about type signatures, or whatever.

Tangentially, this is why we chose Dagger over Guice for dependency injection in Java. Dagger generates the wiring code at compile time, so you get all the niceties of static type checking in plain view, right away.