caveat: real work != internet. cgi is still very useful for those super small internal one-shot scripts.
http://www.mail-archive.com/fossil-users@lists.fossil-scm.or...
tl;dr: sqlite.org and fossil-scm.org run using a simple HTTP server via inetd and some parts of the website are CGI scripts. In 2010 they served over a quarter million requests per day on a tiny VPS with only 3% CPU load.