See and avoid is a remarkably over-rated talent on the part of most GA-pilots.
Most of us have also had one or more scares in good VMC where we didn't see the other guy until the last minute.
There are many more collisions outside controlled airsapce in VMC than in IMC (where there have been none in 20 years). Too much to be explained purely by the glib assertion that nobody is "daft enough" to do it.
There are plenty of parts of the country where a radar service is not available outside controlled airspace. Does this mean that the non-Instrument Rated GA fleet should ground-itself in those areas when the cloud rolls in.
Big sky small plane, as a theory doesn't work too badly providing that you don't shorten the odds by crossing beacons and squeezing yourself into other obvious honeypots for aircraft. This advice is as valid in VMC as it is in IMC.
Get a radar service where you can - but you won't necessarily die if you are not under one.
2D