I work remote, so I spend quite a bit of time at coffee shops and other places like that... MagSafe on my laptop has saved my laptop countless times. Sitting on a small table the rubber feet provide enough grip that if you give the cable a quick tug it becomes unplugged.
I am definitely going to miss MagSafe and am hoping the third party market comes up with something that will emulate it enough to where I don't have to worry about my laptop going flying because some cut doesn't watch where he is walking and accidentally kicks the cord.
Yeah, if you have it sitting on your desk and slowly pull on it the magnet will hold... but give it a quick tug, laptop will stay, cord will come with you.