Well I don't normally ride in my city but sometimes I do... always clipless. Once you get used to them the action of unclipping comes so naturally that stopping suddenly does not pose a problem.

Lately I have ditched Crank brothers pedals and moved to Shimano A530; nice and light with platform on one side, giving more options. I haven't the situation that I need to fold pedals, makes such an insignificant difference anyway. I suppose if you're toting the bike folded around in a bag, then folding or removing pedals is an advantage.