Even if all 50 responders are developers, which we don't know for sure, that wouldn't represent the views of most WP devs.

I, for one, am a WP plugin developer who loves the customizer. Why? Because my main goal with each plugin is "ease of use" for the user. I have leveraged the customizer into a (niche) plugin to allow users to edit colors in a chart image, and they can preview the image colors changing instantly. I couldn't provide that ease of use in my plugin without the customizer.

Thanks to developer Weston Ruter for a job well done.