Maybe you should explain how voltage is analogous to physical water pressure.
Gravity and pumps create water pressure and it is held back by a valve. On the other hand electricity does not need to be held back as there is no "pressure".
I can think of a lot of ways pedroeb, but this is the one I want to try. Since you think voltage is not pressure, I will put both hands across a 12v car battery if you will hold your hands half an inch above a 12kV panel. Since voltage isn't pressure and you have to complete a circuit you should be okay with doing this. When I am fine and you are fried we will see who still thinks voltage isn't pressure. Deal?