It sounds like less an issue with DTW and more a function of the weather. I've never had a problem moving quickly within the airport and neither, it seems, did you. How many other airports let you move with children from one terminal/concourse to another within 20 minutes? Try it at DFW or IAH and see how successful you are.

Personally, I think DTW's NW MacNamara terminal is one of the most intelligently deisgned airports in the world. I'm sorry to hear about your experiences, though. No GA should let people sit where they wish. The FAs can do it but should wait until the door is closed.