For the most part the parking brake shoes and hardware only get replaced IF you have rust issues and the mounting hardware fails or you just choose to replace them for whatever reason, the parking brake only gets used when parking and the wear on the parking brake shoes is non-existing in a normal scenario since the wheel never moves to wear the shoes while parked.
As far as it being a horror to replace them IMHO comes from most people who never had much experience in replacing old style "drum" brakes, I have done more drum brakes than I can count or ever remember, some are rather easy but many others are sorta complicated in the fact if you don't get all the hardware installed exactly right and in the correct location and orientation the brakes don't work, but if you have done them many times it's not all that hard to do, especially if you have a diagram of how to assemble the hardware and shoes.
Also it helps if you have the correct tools to do drum brakes, there are some specialty tools for some of the hardware pieces, but it can be done without them if you're creative enough.
But as I mentioned, you shouldn't have to ever replace the parking brakes unless some of the hardware fails, unless you just choose to do so.