With the latest update to FontCreator 9.1, exporting a set of fonts just got a lot quicker.
Although it still takes just as long to create a good font, it is now considerably quicker to update a set of fonts with the same set of changes. If you modify the OpenType features in the Regular Type style, the OpenType Layout Feature Definition script can be exported, then imported into the other type styles. Kerning can be updated to suit the other style with Autokern, and only a few manual changes are then needed.
Check that the export options and revision numbers are correct, save All projects, then Export All to export both *.otf and *.woff versions with one click.