You typically only want that stuff when you have drained your stores of glycogen in your liver. This would typically be after the 3+ hours of high-intensity aerobic activity. Basically running a marathon or a 3+ straight hours of pedalling a bike at your racing pace.
Otherwise, its like American/Canadian football players breathing oxygen out of a tank (you don't see that much anymore on the sidelines) - its pointless since their activity is virtually all anaerobic.
You could just be…a thirsty dude! Gatorade forgets about this demographic!
Those electrolytes/salts aren't necessarily good for you … sports drinks are blamed for the alarming rise in incidence of kidney stones in young children.
Are you one of them?
I just drink them to look cool and health conscious.