Actually I use one and it works great, it's the perfect counter to scizor and other bulky physical hard hitters.
Also, after a BD or two, it doesn't even have much of a problem against STAB Boiling Water from bulky waters.
Actually the only bulky water that switches in to my Volcarona is Jellicent, who is basically setup fodder and is then muscled through with Volcarona's boosted special attacks. The main other bulky water is Suicune, and it'll not be liking boosted STAB Bug Buzz... Swampert sucks and Vaporeon is also pretty much setup fodder. Ulgamoth isn't liking Toxic, but you should be able to sweep within that time.