I can confirm that! Even wearing shoes with rubber soles and standing on a wooden floor a 230 V sgock is rather unpleasant! I got bit by a portable record player on a flea market, that's how I know. Of course the floor may have been a bit damp as this happened in a cellar but still, I had an inch of rubber or so between my feet and the floor!
Speaking of ungrounded outlets, a few months ago I got to tour an untouched 1910s apartment (now a museum) and in the bathroom there was an outlet right next to the sink!
