If you ignore the security implications, the plugin mechanism is astonishingly productive - I needed some 301 redirects, so I searched the plugin dashboard for "redirect", clicked "install" and instantly had a new control panel for setting custom redirects.
The variety and quality of available themes is even more impressive. I'm beginning to understand why the overall ecosystem is such a powerhouse, especially as a tool to enable technical-but-not-software-engineer people to build and deploy their own complex sites.