Actually, the gate checks at DTW have been gone for about a month now. I flew on 11/15, and they checked ID's at security and announced at the gate that there would be no ID check there. Much better, because now when I have an upgrade I don't have to hold back on boarding and let someone else take the gate search.
Also, I will second the endorsement of online check-in to save time. It only takes a couple of minutes, lets you change your seat assignment if there are open seats, and in DTW you can use the baggage check in the parking garage if you have checked baggage.
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Don