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Start/Due date columns are indeed alive an well. Once enabled (on by default, I think), create something in the inbox, the two columns after the context are the date fields. They are only available in the inbox.

They were enabled in the quick entry previously (87693, I believe), but I don't see it currently.

For now, I'm leaving them disable since it gulps up so much screen real-estate. I'm eager for adjustable columns.