I suppose the tricks might work for some people... but I understand most of them and given the extremely high prices for the buffets I tend to look for the higher cost items and will ignore thinking about someone else behind me. I'll also use the scoop and strategically pull out spoons full of the proteins with the filler veggies left behind. Nothing against the folks behind me but given the price they are charging I"m not going to fill my plate with cheap filler.Depends.
Most buffets have a high % of cheap-filler-foods. Foods that tend to be unhealthy, high carb, high fat, high salt/sugar, and inexpensive to make. Filler foods include foods like pasta (mac n cheese), hot dogs/sausages, breads, bread pudding, biscuits, potato, jello, croutons, When they have produce, it tends to be the cheapest vegetables: iceberg lettuce, whole bananas, melon, maybe raw broccoli, mealy apples, industrial oranges, and industrial tomatoes.
When they have more expensive produce it tends to be...hard to access. It will be at the far end of the buffet (from where diners start) and served from a small serving container.
One that made me laugh out loud was a buffet at the Grand Floridian. At a buffet that was supposed to feed 300+ people, they had blueberries, but the 'serving' bowl was the size of a teacup, and the serving utensil was a teaspoon. That = each person is only supposed to take 1 blueberry!?!?!
Buffets are very often set up using psychological tricks like that, where the serving bowl/utensil size indicates an idea of how much of each item they are supposed to take. In the above blueberry example, most people are hard wired to feel guilty if they take all the blueberries, even if that only =1/4 cup of fruit.
I worked at such a restaurant (ages ago) and was sometimes tasked with setting up the buffet.
The WDW buffets are better than many buffets, but the pricing is often absurdly high.
Of course at the end of the day I've still vastly overpaid for what I had, but you expect that at the house of the mouse.