I don't think that anyone actually uses the plugin. It was the very first wordpress plugin and that's why it is important (and why it is included with wordpress). It's a good plugin to look at if you're interested in seeing how plugins work.
People have done some interesting things with the hello dolly plugin though:
SEO Tips plugin: http://thenextweb.com/2008/02/19/wordpress-plugin-100-seo-tips/
Edgar Allen Poe plugin: http://www.shadowmanor.com/blog/?p=388
Hello Dolly history: http://sudhakar.co.in/2009/hello-dolly-a-salute-to-wp-developers-for-this-plugin.html

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