Data Points
Entering at MIA: Officer asks if we're married, no. Living together? No. Well you're not supposed to come up together, but we'll just say you got married in the Dominican Republic, congratulations and welcome home.
Entering at IAH: Married? No. GF had to leave line and wait her turn.
Multiple entries (ATL, IAD, NAS, YUL, etc.) since being married: Never been asked, even before she changed her name.
That one guy in IAH was just mean.