I've also been reading and enjoying the book. However, I have been going through and making sweeping changes in the codebase I am currently working on. Why isn't my stuff breaking? Because I am only changing one thing at a time and I'm running the tests after every change.
I can feel confident that I am not hurting anything and I'm very confident that some of the tricky bits in my code are much easier to understand. The poor programmers who will have to go in and maintain my code may not notice it, but they would certainly have noticed some of the things that were in there before.
In fact, I've committed my .perltidy.rc file to the code base to ensure that programmers who follow me will find it easy to at least maintain consistent formatting.