Here's the trick that we use: carryon only, pre-printed boarding passes and pre-filled C&I forms. No need to visit the airline counter, skip the checked bag line for customs. We got through security in less than 30 minutes on Easter Sunday. The customs line for checked bags was longer than the line for immigration. There's a separate TSA Pre-check lane once you go through the TSA checkpoint, but the only benefit is keeping your shoes on.

Cheers, RickG