Not to veer too far OT, but when I was flying YYZ-ORD last month, the gatekeepers at YYZ *did* ask to see my GE card. IIRC it was an agent checking BP's right before the CATSA security x-ray belt. I remember having to fumble around for it because I wasn't expecting them to ask. I think it's more to keep non-GE folks from mistakenly getting in the wrong line. I'd imagine if you insisted you're GE they would let you through, but I could be wrong.