Carbo-loading makes sense
If you complete an endurance performance that lasts longer than 90 minutes, then you would do well to fill your glycogen stores. This can improve your performance by 2-3%, which can make a big difference over long periods of exertion.
Your meal plan during carbo-loading can and should include confectionery and sweet drinks. The main thing here is that you can consume the required amount of carbohydrates without any digestive problems.