I crossed twice recently on a well-traveled bike and they took little to no interest. One of those times the border agent hardly looked at my passport, so intent was he on letting me know that I could have jumped the entire lineup, not just 98% of it. He suggested riding the sidewalk next time.
A certain proportion of people get hassled, just as always. I don't know that the unlucky ones can be predicted with any certainty, but the same rules as ever still apply: stay calm and relaxed, clean up truck and self before approaching, have documents ready, don't volunteer information, emphasize (if asked) your stable employment at home, etc. etc. etc. Oh, and choose your parents wisely: they are as suspicious as ever of dark skin, arabic features, any language that is not American English and so on.
They do have the right--as always--to strip your car, your laptop and your corporeal self right to the bone on any faint suspicion of anything illegal, so try not to give them any excuse.
There are a lot of new recruits in uniform, and some of them are neither the brightest nor the most grown up people I've ever met. I apologize on behalf of my government in all its misguided splendor.