His advice includes "The drive to Valle Nevado was uneventful, but we were glad that we took the transfer, as the road to the resort is very unpleasant. The Andes are really, really steep and you are crawling up switchback after switchback. Note to yourself: don't drive in the Andes unless absolutely necessary..."
I don't think the Andes are particularly bad for mountain roads. It's just unusual how much vertical they climb for North American skiers, especially when interstates serve our major resorts. We do have some high-pass or big-access-road resorts: Cottonwood Canyons, Mount Baldy, Bogus Basin, Whitefish, Schweitzer, Taos, etc., but they usually have shoulders.
Honestly, I am more impressed by how poor the roads are in Europe, especially to mega-resorts like Val Thorens, Monterosa, Alpe d'Huez, Saas Fee, Cervinia, etc. And I have only experienced Coronet Peak in New Zealand.
Anyway, I thought the access road to the Santiago resorts was scenic and relatively crowd-free in a previous August, so I could take a quick photo while driving or from the roadside. Weekdays had light traffic, but you still had to pass some drivers. Weekends were more crowded, but with 2 lanes in each direction, passing was straightforward. There was snowfall (4-6 inches), but the snowline/accumulation was almost at resort level.
However, by Day 4, I was done with driving/daily commuting, no matter how beautiful the views were.
Photos to set personal expectations/comfort level - all over 4 days in August 2016, commuting from Las Condes/Santiago, one minor snowstorm overnight on day 3.