This sounds very similar to my experience, except I'm the idiot who babied the car for the first 57,000 miles. After that it was in the shop every 5,000-10,000 miles with SES lights for repeated rounds of injector replacements.
They put in a new DDE in November, and since then no SES lights but I'm still concerned. No one seems to know if the bad DDE was the issue or something else caused the DDE to fail.
Corbin, have you seen any other issues since the DDE replacement? Deed, have you had any more SES issues?