I think you have cause and effect mixed up. The U.S. became a postwar economic superpower not because of the Marshall Plan, but because its chief competitors in Europe and the Pacific had utterly ruined one another’s economies after years of total war. Meanwhile, the United States’ manufacturing capacity had continued to expand.
The Marshall Plan certainly exposed Europeans to more American products, especially Hollywood and pop culture. However, the majority of Marshall Plan funds were given as grants, not loans - ultimately, even to Germany. American capital did not come to own and exploit Western Europe. On the contrary, one of the Marshall Plan’s main effects was to reduce intra-Europe trade barriers, setting the stage for the E.E.C. and later, the European Union.