Or ability to batch change the connection string from A --> B for all tools using A.
Or ability to set a default "saved connection" for a workflow and if you change it cascade the change to all tools.
Case: you have numerous connections in a workflow to a database. You then either:
a) move your data somewhere else and need to replace all the connecitons
b) OR have a standard process for working against DEV, Staging, etc. and want to switch the workflow to use a different saved connection