The writers of these articles seldom invoke the square-cube law explicitly, but that’s what they’re talking about. In some cases, they go beyond just saying that big cubes melt slower and also claim that they do so while cooling your drink just as much. These claims should be looked upon with a gimlet eye, because the cubes’ melting is what does the cooling.
So big ice cubes do dilute less, but at the cost of less cooling. As a whiskey drinker I have to say that there is little reason to use ice in good whiskey. The main reason people actually use ice is not for the temperature, but more often to dilute the strength of the drink, which is sad and wrong. Those that do that to any whiskey better than the run of the mill whiskey deserve to be banned from all whiskey for life.
I’m not saying all bourbon drinkers are douchebags, just the ones that drink it because it is the “in” drink at the moment. People who do that are clearly douchebags. It just so happens that this class of people get all hot and bothered over big ass ice cubes. ↩