A recent reddit comment chain said
Loose lips sink ships... Loose tweets sink fleets...
then
The more military ships at the bottom of the sea, the better.
finally
Because, as history shows, military ships sinking to the bottom of the sea in large numbers is typically accompanied by long periods of peace and harmony.
Were there more ships sunk during WWII than the time since then? I guess you can say that decommissioning the ship doesn't count by sinking, but I'd include any military sinking into the figures.
Were there more ships sunk during WWII than the time since then?
In a nutshell: yes, both due to the scale of WWII (both ferocity and sheer number of naval warships involved) and due to the lack of naval conflicts since the end of WWII.
In fact, since the end of WW2, there have only been two conflicts involving major naval clashes: the Indo-Pakistan War of 1971 and the Falklands War of 1982.
As an example of this, this article by the US Naval Institute highlights that over 350 US Navy warships were sunk during WW2, while since then fewer than 30 US Navy ships have been sunk due to the enemy or accidents.