So I figured this out on my own.
If you have deleted either "Web Forms" or "Web Projects" from your space, (and emptied your trash as I did - otherwise you can restore from there) - you need to re-run the bootstrap for WCM. So, if you've deleted and flushed one - do the same for the other (if you have content underneath them, move it elsewhere). I say this because I don't know if re-running the bootstrap needs them both to be gone permanently. (maybe)
So…. go into mysql, 'use' the alfresco database, and once you're pointing there, the table you want is: alf_applied_patch
This table keeps track of what patches have been run. If you do a "select * from alf_applied_patch;" you will see everything - including the WCM patch that creates the two folders. So… do this:
delete from alf_applied_patch where id = 'patch.wcmFolders';
This will remove the record that WCM's Web Projects and Web Form folders were created. Restart alfresco, and (assuming the bootstrap xml file is still where it was when you installed WCM) you will see in your log file you'll get confirmation that the folders have been re-created!
Ed