I see this as far more of an indictment of gratuitous trackstanding, than an commentary on the merits of clipless versus platforms. I've never understood why people won't just learn to put a foot down when it is appropriate. The only thing I find more annoying than the excessive trackstand is the 'circle' manuever (wherein the cyclist just circles in a space that he/she believes is unoccupied, and likely to remain that way).

For the record: I ride clipless in an urban environment. I've never fallen because I failed to unclip. I did, however, fall one time because I failed to loosen the strap on my toeclip. That was in 1986.