Personally I think is a need. In order to prevent ur equipments from get fungus attack n will save alot of preventive works (eg. replace dry agent, take ur equipments out once a while prevent the rubber components of ur equipment from drying up)
In Singapore weather, where the humidity is constantly high, I find that getting a good dry cabinet is a safety catch to protect our investments. I've seen badly fungused lenses to know that it's really worth it to protect your gear.