As posted above Airbus reccoment that unless you have something in addition to the smoke warning. (fire service report via RTF, signs of smoke etc) then you should disembark the passengers not evacuate.
I just started a general post about this over in Tech Log, be interesting to see the various opinions.
Ps. I just read your post again.... That is talking about an actual fire and or smoke (100% agree with that statement) however as far as we know the VS flight had nothing other than an ECAM smoke warning.
Warning only would ring true considering how quickly the aircraft was returned to service.