A lot lot lot more, at least in my experience. As a premed, you sit in the corner and don't talk. As an M1, you were offered to do things, given real advice on various parts of medical education/career. I got to scrub in and run a camera, just me and the attending, before M2 started, and I definitely got to know the attendings pretty well. It also changes things when you know you'll actually be working with the people you're shadowing.
I shadowed at least once a month for a lot of M1/M2, and it was great. Definitely made me feel more comfortable starting my first rotation, too, because I'd gotten used to the hospital environments here, and gotten my hands dirty a few times in surgery, doing ER procedures, etc.
Plus, it was interesting. M1/M2 was kind of dull. There wasn't much to DO, just check the boxes with the curriculum, but otherwise my days were really empty. I filled them with fun things like sports and going out with friends, etc., but honestly the reason I want to go into medicine is because I find it actually enjoyable to be in the hospital, so doing so was good for me and kept me motivated.
Come on man, no need to generalize. Some of us get something out of shadowing. Some of us enjoy the time spent, or make connections we feel we need, or find cool research by getting to know more people. Don't knock other people's preferences and paint them as somehow dumb or shortsighted for doing things differently than you.