Re: "The coders are probably all too young to remember that..."
Also, taking into consideration Moore's Law (yes I know it's a rule of thumb, and probably can't be projected back to the '40s). With a doubling of processor power every 18 months, computers in 2019, would be 2^52 times faster than they were in 1940.
Using the same encyrption techniques, but using 256-bit, rather than 88-bit encryption, the decryption time of, for argument's sake, 12 hours in 1940, using the same hardware would become 5 x 1047 years (that's 6 x 1037 times the age of the universe).
Applying Moore's law, and assuming faster hardware, that still comes out at 1.4 x 1022 times the age of the universe.
And algorithms are better now.
Even if my back-of-an-envelope caluclations are out by 30 orders of magnitude you're still talking about hundreds of years.