You are one of the lucky few. :-)
Be sure not to invest your savings in mutual funds. Form 8621.
Be sure to avoid the local equivalent of an IRA if you want to do retirement savings. The IRS might not think it is a tax-free pension. And they might think that employer contributions are taxable income to you.
Don't own stock in a foreign corporation. Don't become an officer with signature power over the corporation's bank account.
Be sure to report all of your bank accounts and investment accounts on FinCen 114 (the new FBAR). Don't forget Form 8938 as well, if it applies to you.
I'm not saying you can't have a simple tax life as an American abroad. I'm just saying that you have to have a simple life in order to achieve it.
The problem is not with the U.S. tax liability. As you said, the foreign tax credit will take care of that. You won't pay U.S. income tax. The real problem is with the paperwork and the penalties for screwing things up.