Owing to a long development period, and several changes of the core development team, we have a lot of leftover Views that are no longer being used. However, with pages upon pages of them and quite a large site, it isn't always immediately apparent which Views are still needed and which aren't.
Here is a very small module I quickly threw together yesterday to track when Views are called/rendered and generate a report at /admin/views_audit. I doubt that there is enough general need for this to put it in contrib, but someone out there might get some use of it.
It should be just as happy running on 4.7 as 5.
