The point of the tongue and groove in laminate flooring is that the pieces slot nicely together just as they are. This design cuts down on the amount of work required when fitting the floor — you don't need to, for instance, fill each groove with superglue before placing the tongues therein. Were you to do such a thing, I'd really pity the poor bastard who had, one day, to take the floor up. If all the pieces were glued together, the only way to get them up would be to break them, causing them to splinter and turning the thin layer of plastic laminate into jagged razor-sharp pieces, somewhat painful to carry.
So thank God you didn't do that, eh?