There is some common ground between Boulder YIMBY and NIMBY: the dislike of vehicular congestion. The division arises from their principle areas of concern (highways vs streets) and what the optimal solution is (density vs exclusion).

Now that I live in the city limits, there is one more young-ish YIMBY who will be voting for smart re-zoning, inclusive housing policies which will increase density and enable more folks across the front range to live close to where they bike or walk to work.