I guess the phrase, "lost in a crowd" gains some meaning here. Yes, I've been in that crossing about a dozen times and not once has anyone really looked at me. There are too many of me to make a difference. And there are too many people that even if you did look a bit different, it's hard to zero in on you before you've passed them.
When I was in small towns, I felt I was being looked at, but not totally uncomfortable stares either. The people of Nagahama looked at me a bit, but I looked at them right back, smiled, and greeted them. It was entertaining to see how
they reacted. Some would smile back and nod, or respond, but some would freak a little and not know what to do!
As far as other crowded places I've been to? How about Asakusa close to Senso-Ji? Same thing. People aren't into people watching in Japan, as far as I know, as people in Paris for example. I believe they're into their own thing.
I just saw a program on NHK that shows creative videos and there was one of two girls dressed in black sheets covering everything except their faces. On their faces, they painted an extra eye. They were walking in different pars of Tokyo. One clip showed one on the other's shoulders crossing that famous Shibuya intersection. I only saw one couple look back at them as they passed them. Everyone else seemed to ignore them.
edit: This is the crossing the first time I ever saw it live. It was a Saturday in March and the stores were already open.... Pretty different from your OP video.
‪Shibuya crossing on a Saturday morning‬‏ - YouTube