That's an excellent point and a reason I may never get a smartwatch. For me, I would not really want to leave the house for long periods of time without a camera. Beyond seeing something share-worthy, I use it as an instant note taking, scanning and memory device. My camera roll is filled with maps, posters, receipts, street signs, scans, shop windows, product labels, and other various things I needed a record of.
The creep potential is a lot bigger than its usefulness.