I see. When CRE leader emphasizes their trait via buildings and the such, it really shines on through.
I personally, enjoy seeing the best merits of a trait immediately (or almost immediately). For example, organized requires no buildings to emphasize how awesome it is. It is exaggerated by it's cheap building (courthouse), but it is a powerful trait even without the cheap courthouse. Or charismatic which gives

in all cities allowing them to grow larger earlier. You may have to build units to see the other half of the trait shine through, but everyone needs to build units... even peacemongers.
Cheaper is better, but honestly, it's not all that much faster. I usually end up chopping/whipping the library in new commerce cities anyway. The discount is welcome, but it's not going to give some gigantic edge (like cheap courthouses which are an expensive building in the first place).
And I'm not CRE bashing. I just said that I don't find it particularly useful as compared to the rest of the traits. It's right there with EXP IMO. Cheap workers? Eh, I whip/chop 'em anyway. Health isn't my limiting factor in the early game when population caps are like a sucker punch to the nads.
And you don't like IMP? Cheap workers of EXP are laughable when compared to cheap settlers (which are innately much more expensive). And double GG points? How is that not a nice trait.
But then again, traits are always a matter of personal taste.
What's your favorite trait combo,
MadScientist?