Yes, when it comes to CRM Admin, it is sometimes necessary to know when a property was created. Adding to this idea, it would also be helpful to know when the property was last updated, as that can impact reporting and workflows.
Yes, this would be very useful to have. I have encountered this instance where duplicate fields appear and whilst I can see who created them I don't know when, so when it comes to going back and making sure things are correct it doesn't help.
+1. We're constantly adding new properties to our instance. It'd be a huge time saver to be able to know when properties were added so that we can understand reports we compile effectively.