I think the biggest difference between Colorado and the Washington DC area is preparedness. It's not unusual to get a 5 or 6 foot snowfall in some places in Colorado, and so people are well prepared for that, and they have the necessary equipment to deal with large quantities of snow. It's unusual to get even a foot of snow in Washington DC, and so they're just not prepared for the kind of hammering they're geting now (three feet of the stuff within a week). They just don't normally need much in the way of snow clearing equipment there, and so they don't have the equipment to remove that snow quickly and efficiently.
Here in Winnipeg, they really don't have dedicated "snow plows", but they do have a hydraulic plow accessory and sanding accessory for every dump truck the City has. So, if the weatherman is forcasting a heavy snowfall, then all those trucks get fitted with the plow attachments and they clear the main arteries in a co-ordinated manner, like this:
And, then a team of front end loaders will be working behind those trucks to clear the piles of snow they leave behind across intersections.
About the only place they actually collect the snow and remove it is in the down town core or places where a pile of snow on the intersection would make for a blind corner and people would end up in accidents cuz they couldn't see each other coming. They do that with snow blower attachments on front end loaders. They also have dump trucks co-ordinated to collect the snow and dump it on the banks of the Red River. The snow blower will blow the snow into the truck bucket, and another truck will follow behind. When the first truck is full, then the second one will move forward to take it's place, like this:
Otherwise, the snow just stays piled up at the intersections. The pile shrinks over the course of the winter because of the weight of the snow.