Disconnect battery when parked?

I have had a battery disconnect in my trunk for a long time. I shut it off more for parasitic slow drain, than I do fear of fires. I also agree that even though these old cars don't have security systems or fancy radios draining the battery, there are many things as noted above that still get some power even when "off". Thats why I disconnect it, especially when I know it'll be sitting for a while.