For those travelers heading that direction.
We were there in 2014. We had always heard about the Marienbrucke, and climbed the small hill to go to the bridge. Not only was it crowded, it was pretty much physically impossible to get to it. So, if you wish to go to the Brucke, be prepared for crowds.
. . . and I bet that few people on the horribly crowded bridge will be wearing a mask.
Darn... missed it by that much. ;-)