I just looked up a bit of this on
http://www.usembassy.org.uk/irs/irsfaq.htm.
Given the following quote from their FAQs, it seems as if I can continue being lazy for some years to come:
"I am a U.S. citizen who moved to the U.K. several (or many) years ago and thought I did nothave to file U.S. tax returns any longer. Now I have learned that information was incorrect. What do I do?
This is a common misunderstanding among Americans abroad, and should not create anxiety for those who find themselves in this situation. Generally, you should file returns for the past three years, taking the foreign earned income exclusion, the foreign tax credit, or both. It would be extremely unlikely that there would be any late penalties assessed, since penalties are computed as a percentage of tax owed, and only the rare taxpayer would actually owe tax in this situation. "
Just found this as well:
"If I am able to exclude all my income, why do I have to file?
A U.S. citizen or lawful resident alien is required to report worldwide income if you exceed the minimum filing requirements.
If your tax liability is zero there is no penalty for not filing, but you may risk eligibility for future exclusions or deductions by not filing a timely and accurate return."
So, why would we bother?