Unit Testing Is Going to Take You More Typing to Write the New Code

Unit tests are your safety net and will prove that the refactoring you just did didn't break something else. The whole point of unit tests is they may be factoring so much easier. You're testing that you can set up a unit test and then inside that module, you refactor at will with no worry that you're messing anything up. So overall, you will spend so much less time looking over your shoulder, trying to make sure that you didn't inadvertently ruin something else.