I agree wholeheartedly that php-fpm rapidly speed up nginx adoption.

Before nginx, lighttpd was a thing. It also comes with `spawn-fcgi` to handle fastcgi, but it's a little complex to set up. Back then people were also using `spawn-fcgi` with nginx, too. I remembered reading some tutorial and decided that I will continue to use Apache with mod_php due to complexity. When php-fpm come, I immediately switched.