Are traditional vacuum tubes still used anywhere?
Maybe still some EMP-resistant radio front ends for military purposes. Magnetrons, TWTs and Klystrons for RF, including microwave ovens and industrial microwave sources. 

Also ignitrons and hydrogen thyratrons, and, of course photomultipliers are widely used. 

As Dave Tweed says below, solar-blind flame detectors (such as UVtron) are a current application.