Not to take anything away from the Be Seen commandment, but my general philosophy is to ride like I'm invisible.
This comes from several conversations with over-the-road truckers who ALSO complain mightily that car drivers don't see them. If <your stereotypical driver here> doesn't see an 18-wheeler, s/he most certainly won't see a person on a bicycle, no matter what I wear. (It probably can/should go without saying that the trucker is in a much better position if a car driver does something stupid, still, they are protective of their driving record.)
So, by all means, wear bright colors, but don't assume anyone sees you.
Give big space to the festive dog that make sport in the roadway. Avoid entanglement with your wheel spoke.
(Sign in Japan)
1978 Raleigh Gran Prix
2003 EZ Sport AX