Denver and the Front Range were, at one time, ranked #1 road rage capital in the US
It's true, though it's a vote system among a handful of people, as something like that is INCREDIBLY hard to quantify.
T-Rex and the trains have really opened up I-25 through the city, except during rush hour, but even then it's light yeras beyond what it has come from.
I've spent quite a bit of time in San Fran and have to say that while it's congested and folks drive fast, there is nowhere near the rage levels seen on the Front Range in the '90s. don't equate speediness with rage.
That said, the light rail system has made it possible for me to efficiently get from South Parker to downtown Denver to go to museums, the zoo, shop, dine, etc... Without that we would most definitely drive to get there. We picked Parker because it was close enough to work for cycle commuting, however, albeit on the extreme end of it (17 miles, one way). I can ride 5 miles South to Castlewood Canyon and cross one road. Or I can ride North and end up at the flahship REI downtown, and only cross a handful of roads. Really cool.