It would be really useful to see the timestamp from ObjectId fields while hovering over the ObjectId values in query results. Well designed documents have a field for the creation time, but not all documents have it and then need to go into hoops to take the ObjectId and call the getTimestamp() function for it to see when the document was created.

The ObjectId also contains machine identifier, process id and a counter. They're not that interesting, but could be shown as well.