Example One: 

Christmas Content in Content Channels. Bulk Update Content Channel Items on Jan 1st to have an Active date for the next Christmas. (We have some leader resources for Christmas in Content Channels that this would have been perfect for!)

Example Two:

Bulk add tags or attributes (such as a "Category" Attribute) to help facilitate search and navigation of content on an External Site. This would be especially useful in the event that you wanted to change the available categories to make navigation easier on the external site.