Ski traffic is really the worst part....the roads are rarely too bad to drive on, other than traffic....the CDOT is pretty good about keeping things looking nice, I-70 wise.
When I ride, I try to leave Denver before 5 AM, and I miss it. Anytime between 4PM and 8PM on the east-bound traffic is horrible too....everyone drives their little suv's like formula 1 race cars, bumper to bumper, and the do not seem to realize that a pickup and trailer can't stop like an Audi.
I've never really had a problem over the pass. Just take it slow...that's the key. That area is also pretty avalanche prone, so if they're blasting or cleaning something up, just go back to Empire and have a bite to eat at the cafe. They keep a pretty close eye on it, so I wouldn't really worry about getting caught on the road, but they often close it with little notice, and make you wait for a few hours.