The increase in the volume poured is actually more like 4x, the article clearly explains that the glassware tax encouraged, in the region, glassware which was meant to be filled close to the brim, while modern glassware is meant to be filled to a about a third (or if you're not at a dive, often a quarter) full. Furthermore, the difference in sugar content (and overall in non-water contents) is almost as important as ethanol's share of the volume.
My wife is trained as a sommelier. In my understanding sommeliers generally figure five glasses to the bottle. (When we're pouring for ourselves, it's four glasses, because then we don't have to fight over who gets the extra glass.)
A bottle is 750 ml, so that's a 150-ml pour (five to the bottle) or 187.5-ml (four to the bottle). As the article says a typical glass holds about 450 ml now.
It does, you don't drink liquor the same way you do wine do you?
It is sweeter and more intense, it tastes better in smaller quantities.