If I had found this module sooner, it would have saved me significant effort on a number of site builds. I've written custom modules specifically to create custom blocks that could be managed as config, which is exactly the problem that module solves.
I do still like the idea of using the Config Pages module to allow a site builder to manage a variety data points that can be used in combination across a number of different custom blocks, which is a pattern I used for the Event Platform modules, but for simple use cases this is a big time saver.