It's much more difficult today. The US has unquestionably the best university system in the world, which means American students are competing with students from around the world for entrance into American schools. And of course, everyone only wants to go to the best schools, so they have all these structured activities as a resume-builder.
What I've read is that, ironically, kids with perfect SATs, 80 extracurriculars, who play the violin and speak 5 languages fluently are so common that they don't stand out anymore. The credential inflation has led schools to find alternate methods of evaluating candidates.