That is very true, after the first couple of drinks which as you say are the ones you really enjoy the next few just change your mood, attitude and lethargy. Like most a really heavy session changes the dynamic the day after as well, the motivation can disappear as you nurse the dreaded hangover.I was never a drink-at-work bloke but when I was at my worst my aim was to start drinking as early as possible (end my day as early as possible). Bloody contractor's curse. What set me on the right track was the desire to do actually things - usually that involved a drive. So I started drinking later and later... Somewhere along the line I realised that the first one or two were "the best", and the rest was just going through the motions, so I weaned myself down to just those one or two. After doing that for a while you're no longer addicted. You're free.
The reason I started to read this thread was I'd just been in a three day golf trip (very enjoyable) but had drank too much. I was still suffering a couple of days after getting home, reading the comments on here was quite enlightening. Posted I was having a few weeks off the ale, about 10 days in and at the moment due to this thread I have no desire to have a drink, a bit concerned what the booze has done to people on here.