Actually, what is amazing is how subtle it is for what it can accomplish - you’ve sort of discovered it’s magic without knowing.
To demo it, I would find the harshest recording you’ve done or something - a vocalist with a little of sharp harsh resonances, or a harsh violin or something. Or if you do a lot of extreme hipass filtering where there is only frequency above 1k, you can use it to tame and even out any sharp frequencies.
If you are working primarily with professional sample libraries and VSTi synths, you may not need this tool tbh.