I think you're looking a bit further back than necessary. FiveThirtyEight oddly enough did a bit on ADHD pharmaceuticals here [1] that gives some numbers. So for instance just between 2008 and 2013 adult usage of ADHD medication doubled. It was currently at 2.8% and has undoubtedly continued to skyrocket since then. And that number is dwarfed by how quickly we're putting young children and especially boys on it. In 2013 we already had 9.8% of boys 12-18 years old on ADHD drugs - and those numbers again were, and presumably still are, rapidly increasing. And once again the numbers as recently as 1990 were very near 0.

At least from your post it seems to me like you're talking about something like the 50s. You need only go back a decade or two to see tremendous differences in rates of psychotropic prescription and usage. And the sheer numbers here mean that if these drugs are as having as large a positive effect as many users do believe them to be, then we should be able to see tremendous macro level positive indicators. But I'm not sure we really do. By contrast I could certainly point to sharp increases in a variety of physiological and psychological disorders which are considered side effects of these treatments.

[1] - https://fivethirtyeight.com/features/dear-mona-how-many-adul...