Sanity Check is a collection of several tools. Common for them all is that your sanity would be at risk if you try to do this manually.
Check worksets tab
Gives you a list of all the worksets in the model and what they contain. From here you you use a simple Drag `n Drop to move elements onto the correct workset.
Workset Visibility Settings tab
Controlling the visibillity settings of worksets across all views gets easy with this tool
Performance check tab
A virtual health check of the model with suggestions as to how to imrove it
Views with View Templates
List views and what view templates have been assigned to them
Imported and Linked Files
Control what has been linked/imported into the model. Easily see if they are pinned, hidden in view, etc.