You can now find your files faster than ever!  If you are using the Media main menu entry, you will now see a new filter option for “Uploaded by:” – you can select either Anyone (to see all files), or just “me” to show only files YOU have directly uploaded.  Remember, the vast majority of files were uploaded during migration, so even though you see them and have access, they weren’t necessarily uploaded by you:

 

If you are viewing your library while editing a page, you can achieve the same thing by selecting “Uploaded by me” from the first drop down in the filter: