I've started doing this for our 400+ reports. I've already gotten it down to 256. Most of our admin reports have been pared down to just one report for each type and using filters & views to simulate different reports.
It also became admin policy to share our own custom views, filters and groupings with the admin team via our own admin layout to avoid duplicates.
We've also suspended permissions for regular users to create their own filters, views, and groupings. After perusing the user created ones, I discovered most of them were not showing what was intended due to the users lack of technical and API knowledge.
Thanks for this Quick Tip series. It's really been helpful so far..