That scripture always seemed to be used in a way that made you doubt your own feelings (sorta in the same way as the "heart is desperate" scripture). No one but maybe a few of the super-indoctrinated, or those who have their meal ticket from the WTS can possibly agree that the JW load is light. That scripture is then trotted out to tell you that your load is light, and you'll accept it because it's in the bible and it just starts to cause you to doubt your motivations and thoughts.
Along the same lines was the "yet your commandments are not burdensome" scripture that they love to use. "All these rules are for our own good!" they say. meanwhile everyone feels loaded down and burdened by everything, so they think that there's something about themselves that they need to fix. Surely they're not doing enough!