Ride sharing certainly increased my chances of getting home successfully, though my anecdotal experience is it wouldn't have had an impact on levity or intoxication.
By the time I entered the workforce in 1999, this sort of thing was on the wane, although it varied enormously by industry and company. I think the change happened because of the increasing computerisation of jobs (where you could do more damage with the tap of a finger), in addition to women joining the workforce in more senior positions. And probably longer commutes, tougher drink-driving laws, and more formalised HR policies.
A small part of me is nostalgic for it, but it was obviously ridiculously unhealthy. That said, a lot of work was actually done in the pub, and it's possible that people found solutions with their social guard down that they wouldn't have found whilst in the office.
This was the end of 1998. The company was traders and there were numerous bottles of hard alcohol in the open. I was amazed.
Having lived in London when I was younger I beg to differ. I only ended up at the last stop and having to walk home a couple of miles a few times. One time I managed to cycle from Leicester Square to Chelsea - I don't know why, I didn't live anywhere near Chelsea.