I chill using a coiled copper chiller for all of the brewing reasons mentioned, but also for safety.
To ensure no infection I get the wort into a fv asap, as I brew outside in the shed, and ferment in the airing cupboard - so i don't want to be carrying near boiling sugary liquid around. Granted I could let it cool naturally, but I want the wort under airlock in the shortest possible time, I generally pitch the following day after aerating with a degasser.