My view is that the main advantage of this would be in a situation where a lot of dissimilar types mix. If you're on a GA field with a lot of Cessnas and Pipers flitting about I'm not sure it will add a lot beyond the opportunity for a bit more confusion on the radio. My flying is often on a field with a lot of the abovementioned types, added to which are some Diamonds and the odd AT-3 or others, almost all of which are painted white or mostly white. When slotting into the circuit the colour or type is not always going to be a lot of help and sometimes I just check that there are two in front when I'm positioned as no.3 in the que. Helicopters and slow-movers use either a separate circuit or are discouraged from visiting.... so perhaps this field is not the best example here.