Not true. Rarely do you (a cog) see the hiring process (a different cog) used by your massive company (the machine). Especially when you're just out of college.
Do the big companies you work for not have people interview with employees in their particular role? It seems relatively common among my friends for them to be interviewing people just 1-2 years younger than them, either for internships or to fill the position they're about to be promoted out of.