I've had a Nexus card for a few years now. It's primary value for me is border crossing by car as many border crossings have a dedicated Nexus line. Larger airports will have TSA pre-check line to get you through security
with less hassle and if you fly internationally get signed up with Global Enrollment. Crossing into the US from Canada
by boat is easier with Nexus as you won't have to check into a "Port of Call".