The Poor Man's Family Updater

When you adopt a new version of Revit and you have a lot of families you want to upgrade, a relatively quick way to do it, is to open the new version of Revit, then select the families you want to upgrade in Windows Explorer using the shift key or ctrl to select a bunch. Then just right click and pick open.

Because you have the newest version of Revit open already, windows will open each of the files in that single instance, upgrading each file on open. Seal the deal by saving before closing each file.