The second kitchen sink was Perl. It was designed to grow between shell and C, making both more convenient. In the process, every conceivable thing that was already handy in shell (awk, sed, grep) and every handy thing in C (strings, file seeking, etc) was tossed into one huge Enchilada. In the chatterbox, many moons ago, merlyn himself said: 'Given that I use the kitchen sink of programming languages (Perl), it only makes sense that I use the kitchen sink of editors (Emacs)."
And now we have perlmonks. It is like perl month in that you can publish serious articles and get feedback. It is like alt.religion.emacs. It is like IRC with the chatterbox. It is like the fun with perl mailing list with the snippets and obfu section. And instead of being glue for various external services, it all mixed together in the everything gumbo pot. Instead of pure HTML, we have an ad hoc semi-HTML with wiki-isms mixed in. But it does work and it is popular.
I'm a purist and a huge fan of decoupled design. I glue together individual components that each do their job well (that's the unix toolbox way). That's why I work so hard on HTML::Seamstress and avoid jobs advertising tt or Mason as the dynamic HTML tool. But all in all, you have to give the kitchen sinks credit. In fact as a user of XEmacs, Perl, and Perlmonks, I do more than give them credit. I use them everyday... ole!