At some point I realized that the DC FSA is essentially a discount equal to your marginal tax rate, but the Dependent Care Credit is 20%.
So if, like me, you're in the 22% bracket, then the FSA gets you an additional 2%. In other words, every thousand dollars in the FSA is worth twenty bucks. To me, that's not worth all the planning, stressing, and risk of not using the money.
If your income is lower, then the Dependent Care Credit is even a better deal. And if you've somehow made it into a higher tax bracket, then God bless you.
Obviously, I don't intend this to be tax planning advice for your specific situation.