In this world, the relief which is felt after a period of suffering is proportional to how far removed one is from the suffering. Indeed, man's toil for spiritual matters is an end in itself, and this is why blessings and rewards depend on it. In truth, this is an emotion which can be felt in this world as well. Even in this world one can appreciate that his toil for mitzvot is worthwhile. Bringing forth bread from the earth is not an act of creation, it is something done within the world as it exists.
Oxygen is everywhere.
Water, too, is available almost everywhere. Bread is also readily available because it is a staple of life. When Hashem created the world, it was understood that He would create bread because it is mankind's primary food. Bread was not a separate creation, and this is reflected in its berachah. On the other hand, all foods besides bread are luxuries, and their existence requires a separate act of creation, as reflected in their respective berachot.