This was posted on the public GTD forum by @Testeq. It is funny and yet compelling. A great analogy!
"What about a car? Doesn't it distract you?
Are you distracted when you take a seat behind a wheel? There are so many options, so many roads to take at each intersection. Isn't it overwhelming?
GTD is like a car. You can use it to go where you want to go or you can take random turns and complain that "the car doesn't work".