Not all of us. I have been writing open source since approx. 1998, and I remember hosting my code on sourceforge, and announcing on freshmeat. There was also a few other central repositories, and some major projects having their own CVS and later Subversion repositories. Later came Google Code that I used too, circa 2004 or 2005. But I clearly remember people, myself included, looking for a code repository they could use for their source code.