I don't think it makes any difference which line you use. I'm sure if a GE member uses the regular lines that the CBP agent will know that the pax has GE. Get caught failing to declare and the possible repercussions will be the same. Indeed, it might be worse - you might get asked why you chose to use the regular line instead of the kiosk - it could look suspicious (like maybe it's because it's not your passport and you avoided the kiosk because your fingerprints don't match).

You're still taking a risk by not declaring everything, even if you know it's allowed. The penalty is just greater with GE, because in addition to any other punishment you may receive (lecture, fine, flagged for permanent secondary), you also lose GE.

It hasn't changed what I bring back, but the zero tolerance does mean I am aware and now declare things I never declared before: energy bars from the US that left and came back with me, gum, cookies, tea bags and chocolate. I was not aware of the drug requirements, so now I'll have to start declaring the antibiotics and other meds that I always take with me. It takes longer (almost 20 minutes to wait in line to get my bag xrayed at an ag station because I declared a box of chocolates), but still better than the wait if you are unfortunate enough to be sitting in the back and you are the second (or third) big plane to land in a short time.

But then I admit it, I am zero tolerance for risk when it comes to anything to do with the government. Not advising anyone to follow my lead, just sharing my thinking and approach (very conservative).