Most of my applications are built using Perl and the excellent CGI::Application module/framework.
I've used Dancer a couple of times, but that tends to be for smaller applications, and it has to be said that the last remaining dancer application I used in production was replaced by a port to golang this morning. Partly for a fun learning experience, and partly to simplify deployment.
For new projects, if they were small and self-contained, I'd probably gamble on golang. If they were more complex, or I was in a rush, I'd use Perl.