When we are looking at the list of tables, we can see all the occurrences used in Graph.
Why not have the same idea for fields. Just like in a DDR in the columns it would show you where the field is used.
Add a new category to Options/Comments toggle called Field Used In.
OccurrenceName | ScriptName | PortalName | LayoutName | ValueListName
This would help developers to track where the field is used and would make them investigate further if they really want to delete the field or Not.