For the majority Americans (except in Hawaii), the only language they encounter besides English is Spanish (and French in Maine & Louisiana). Personally, I speak English, Polish, Slovak and a bit of Spanish, German and Czech.
OTOH, my relatives in Poland speak Polish and my relatives in Slovakia speak Slovak. Oh, they may know a few words of Russian, German or English (depending on when they went to school), but they never use it and so forget it mostly.
It's great that you were able to pick up those tongues, but would you go learn (say) Finnish or Tagalog on a whim? Probably not. It's not a matter of being lazy, it's a mater of use.