Speeds up the process of importing the ICS file. If the developer figures out to also preimport the file, that would make it even faster. i.e. only selecting the end calendar. Great add-on!

After you save the ics file, this app opens the Google Calendar in the right place, in the import+export option and the 'choose your file' for importing.
It does not (currently) add the calendar info directly in Google Calendar, but it makes it much easier because you do not need to open the calendar and click your way to the import option, so it is very useful.