Rails/Grails/Node ... I'm still using Spring MVC a lot for implementing REST-like APIs (annotated controllers are all I need). These APIs are the foundation for client-side templates (currently I prefer Handlebars) then.

Granted... Spring MVC requires a round-trip for API changes as well compared to more dynamic languages but it's quite short due to the compact and focused backend-code base.

BTW: one more thing which I initially did not mention is that Wicket generates a hell lot of client-side code with loads of nested DIVs (per component probably), weird and long wicket IDs which tell you nothing (they are automatically created). Pretty tough to get used to - especially for someone trying to understand what happens "under the hood".