You can find the number of records that have a property value from settings > properties > edit (a property) > basic info tab.
If you're auditing properties and want to archive properties without any values, this can be a time intensive process.
You can export property information in bulk but it doesn't include the number records that have values either.
I don't see a need to change the user experience because its just fine for one off lookups, but it would be great to add this information to the bulk property export.
In a perfect world, I could filter properties based upon the number of records with values, and while I'm asking for things 🙂 other filters like the last time it was used would be great.