Got a lanyard when I was 16 in high school for my car keys... Almost 23 now and still use a lanyard to hold my keys... I don't know how you guys think it gets in the way, mine easily fits in my back pocket of my jeans. And I have (knock on wood) never lost my keys because it so easy to identify them, unlike my phone and wallet.
Not to mention it is very useful to put around your neck when you have to carry groceries, makes it super easy to unlock your door when your hands are full. Plus the NS lanyard that I am using has a built in bottle opener, that is always convenient.