ept-cache infoand make sure that the popcon and debtags data sources are enabled
ept-cache search -t clean -s t- | less
This will show you all packages that are not shared libraries or application data, and will show you at the top of the list those packages that you have installed and other people are very unlikely to have installed.
You can use that list in case someone asks you "tell me of the cool packages that you use".
If you need to improvise a talk at some Linux event, that list could very easily get you started and talking for hours.