As far as mass casualty incidents go, its a little difficult for the Fire Service at a brigade/group level to train in casualty handling. Even on small scale jobs, we still just pull people out and punt them to the ambos. This is pretty similar if you are talking mass casualty, resulting for a job that is not a CBRN(E) job, but simply a straight forward firefighting job. If people need to be 'constantly' trained to simply setup the triage area NOT in the smoke/collapse zones, then there are issues.
I'm all for having simulated mass casualty exercises and would like to see them run at least annually, with multiple agencies involved, be it with a CBRN(E) flavour or just a large scale building fire with multiple trapped/injured.
It probably a different kettle of fish for the SES, given that you have responsibilities that stretch into USAR/Disaster recovery.
As for Cold Storage facilities, I find it worrying that with numerous large scale fires in both Australia and Overseas, some of which have resulted in fatalities and serious injuries, the CFS appears to have done little to inform brigades of the dangers associated with Insulated Sandwich Paneling construction, and especially panels with an Expanded Polystyrene core. There are a few videos floating around that I have been unable to locate demonstrating a small room of ISP construction being burnt, its a very sobering watch to see how rapidly the fire spreads and the violence of the fire behaviour. In addition to the fire behaviour, you have the delamination of the panels and the hidden fire spread which is a very very bad thing. Add in some refridgerant gas and I hate Cold Storage places.