Is anyone even using CF anymore especially in production? The spring/tomcat jee based setup seems a bit antiquated when there are so many lighter weight alternatives available.

Cloud Foundry is mostly written in Ruby and Go.

New components are generally written in Go and several Ruby parts are being progressively replaced by Go parts (especially Diego).

Pivotal (my employers) sold $40 million of PCF in the first year of sales. So it's got a bit of traction here and there.