You'll probably use it quite often - second only to rename refactoring. To try it.
When working with a discrete partition, for instance, you can't perform a rename refactoring without being able to check out and modify every other partition that needs to be updated by the action.
The Ruby development tools have had refactoring support for quite some time now, implementing for example various rename refactorings, extracting, moving and inlining of methods.
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