There's a huge difference in how "filling" beers are. Drink a 6-pack of lager, then drink a 6-pack of stout. One is like water, and the other is like drinking a brick.
I never really got the "less filling" thing. Is it really that "less filling"? Are people out there saying "screw taste, I want to be able to chug the shit all day"?
Maybe try a beer with some alcohol in it and this won't be an issue