Yes, but this is potentially counterbalanced by the increased dependence of modern work on clear heads. It's quite possible that the more manual, unmechanized work of pre-industrial societies was more immune to the effects of alcohol than even menial jobs today. It's also possible that modern technology raises the epidemiological cost of drunkenness in some ways; they didn't, for example, have too many drunk-driving deaths before there were cars.

Like I said, it's a complex area of research. If you think you're able to draw any meaningful conclusions based on your own intuition, then I think you're being a tad simplistic.