I had an AP on my last trip, and several times CMs gave me the Passholder discount before I said anything, because they noticed the Passholder slider on my MagicBand. In those cases, they also didn't ask for the Passholder ID. I think I only showed the Passholder ID three or four times, when I bought stuff at Downtown Disney.
The ID thing varies from CM to CM. My guess is that it also varies a little depending on how big a purchase you're making - if you're trying to get a discount on a thousand dollar purchase, they're probably more likely to check your eligibility for the discount than if you're spending twenty bucks on a few magnets or a t-shirt.
And yet Disney in many cases would do nothing if merchandise were just stolen.
The constant demand for checking ID at Disney is just obnoxious.
I agree. ID is meaningless to any sort of security, except perhaps to prevent credit card fraud (or in WDW's case, park pass transfer). Ironically, all of the major credit card companies specifically prohibit merchants from asking for ID and requires them to check signatures on the card against signatures on the receipt ONLY. Yet many vendors today demand ID whenever you use a credit card, and completely ignore the signature.
The European chip-and-pin system cannot get to America fast enough for me. Of course, we're going to have to endure several years of chip-and-signature nonsense during the "switchover", because Americans still seem to think that their signatures, which can't be changed if someone learns how to forge them, are more secure than their PINs, which can be easily changed if compromised.