Crossed two weeks ago. Got a 180-day pass. No questions asked. $30. Crossed Saturday, walking on the Mexican side. Agent briefly inspected the visa and passport and waived me through without comments or questions.
Crossing back to the USA about 9:00 am, the line was huge. I estimate that it was hours long. I have Sentri, so I didn’t have to wait. Got the usual questions. Where are you going? Why were you in Mexico? Just said tourism. If you have to catch a flight, plan accordingly.


I had almost the same experience last weekend.
When returning to US at 430am, the border agent only asked "are you bringing anything from Mexico?" after looking into some device (camera) I was allowed back into the US.