Ok, my subject is hyperbole. But anyone who has ever tried to legally immigrate or help a foreign friend try to move to the US knows that it simply isn't possible for the vast majority of people.
I will be brief and concise.
There is no "line." Illegals cannot get in the back of the "line" because the "line" does not exist.
The Green Card lottery is biased against the best countries. Ok, that's not exactly how it works in theory, but that's kind of what happens. Example: In 2012, Japan was awarded 435 visas and Nigera 6,204.
You can't come to the US just because you want to. You can't come regardless of whether or not you have the means to support yourself. You can't come regardless of your education level or English-speaking ability. You can't even come if one of your family members is already here--you must be the direct blood relative of a US citizen, a non-citizen permanent resident sibling is, for instance, not good enough (and becoming a citizen takes decades).
Almost the only way to immigrate (outside of political asylum) is through the arduous and exploitative higher education route. We, the American people, will spend hundreds of millions of our tax dollars to educate foreign students at the best universities in the world. Upon graduation from a prestigious American school with American knowledge, they either must get a job immediately (not easy in these economic times) or get out. Often times, they do get out, and they start those companies which are now out-competing us on the world stage. For instance, I challenge you to find a foreign technology company whose CEO doesn't have a Ph.D. from a California university. Now, assuming that the student is really, really dedicated to staying in the US, there are still substantial roadblocks to them staying here. Firstly, the paperwork for hiring a foreigner is insane. It's insane enough that really the only places that foreign-born U.S. graduates can work are universities, oil companies, or huge technology companies. Any smaller companies can't afford to figure out the legal mess required to figure out the visas, nor can they accept the risk that they'll hire a foreigner and their visa will be denied. The other issue is that if the foreigner doesn't keep their job, they will be deported. They have limited job prospects in the first place due to the visa and legal regulations, and the employers know it. The employers almost universally abuse these people because they know that their only chance to get a green card is to stay employed, the green card process is restarted if they change jobs, and they know that the foreigner wants a green card. So they can overwork and underpay them because they know the foreigner won't quit until they get their green card.
I have tried to figure out legal avenues for some friends in Japan. They have college degrees, speak near-perfect English, and have a passion for America and its culture. Nevertheless, we could not find a route for them to work in the US, so they remain in Japan.