Image credit - pixabay.com
"So.. I'll definitely be using it a heck of a lot more from now on!"
You can buy an annual license of Circloscope for $47 which covers you for 1 Google plus personal profile and 3 business pages.
There is also a Free Version which does everything that the premium version does apart from mass adding and removing people. To be honest the mass adding and removing feature was the one I used the most!
You can upgrade your free version to a premium at any time.
Here's the link for the free version - Circloscope Free and a link to their YouTube channel to learn how to use Circloscope.