I work with 48 volts DC almost every day. I can grab onto the main + and - buss bars of the plant which is putting out about 2000 amps, and feel nothing. Its pretty cool. put a wrench in between them and it will vaporize in a split second. Also pretty cool in a different way... The voltage drop of DC would never work in today's power grid though.
In the past 10 years while working on/around DC power plants I only remember being shocked one time. I was a bit sweaty and I had my arm across the + buss bar. My ear touched a ground and I got a slight tingle. Like when you put your tongue to a 9 volt.
The flash from a short will ****en blind you though.
Same thing I do. Heres some of the stuff I work with.