I did this in 2018. Definitely do it.
To get the whole climb, start from Idaho Springs. There is a free parking lot just south of I-70 that you can use. It is across the street from Clear Creak Middle School.
I did it on a Monday with traffic and I did not mind the cars. Probably a weekend attempt would be sketchier. If you can do it without traffic it will be great.
Make sure you can carry plenty of water, as you will only be able to refill at Echo Park, which is about halfway. Past that there are restrooms at Summit Lake Park (about 5 miles from the top), but not water fountains there (I guess you could dip your bottles in the lake tho).
It’s not a terrible difficult climb, but it is long and the altitude is significant. I live at 500ft above sea level and I did it without too much trouble. I didn’t really notice the effect of the thin air until I came back down and got a massive headache. I also took a lot of Ginko the weeks before the climb because i heard that helped (who knows).
The road conditions are nice until you get start getting close to the top. The freeze/thaw cycle creates latitudinal cracks in the road surface. They don’t cause too much trouble on the way up, but you will need to take it slow on the beginning of the descent. Make sure your brakes are up to snuff.
I had to stop twice on the way down because there were mountain goats in the road. So, watch out for that too.
Do this. you will not regret it
Cheers,