There is no Premier line at Pier D, but at the same time because there is a checkpoint for each terminal instead of a single one for everybody, I find it it much less chaotic than IAD. The lines also look long, but seem to move reasonably quickly; I've neve spent more than 10-15 minutes in line, and I usually fly out of BWI late afternoon or evening on Fridays.

In fact, I'm usually less worried about the TSA line than the long walk to the very end of Pier D where the United and Continental gates are located.