Zogger, Snoqualmie Pass gets a tremendous amount of traffic. It is the major route to Seattle from the rest of the world. That and I-5. And yes, our roads get torn up something fierce. Not necessarily from chains, but from studded tires, which are legal to run on in the winter.
Mountain passes are closed several times a winter while crews do avalanche control or clear avalanches or rocks or slides. The CHAINS REQUIRED sign goes up first for trucks, then, if things worsen, chains will be required for 2 wheel drive cars, then, maybe even on 4x4s. I always figure when chains are required on 4x4s, it is time to stay off that pass.
I-90, Snoqualmie Pass, has the cross state traffic, and then, add to that the ski traffic. All 3 major passes have ski areas on top. Snoqualmie and Stevens are closest to Seattle, so the parking lots are full on weekends. I think I have a toothbrush in my ski bag. Slides can happen and skiers can be stuck on the top of the pass.
Sometimes, the State Patrol will have a checkpoint when chains are required and fines will be handed out. Then, like in Idaho, get in the ditch or an accident and they'll ask to see your chains. Not that they are required to be on, but they are required to be in your vehicle.
You can see the traffic on the passes by going to the WADOT cameras. Snoqualmie and Stevens have quite a few up. Oh, and since Seattle became such a popular place to live for a lot of people, there are long backups on I-90 on Sunday afternoons when they all leave from the drier east side to go over the pass and get home. Look on a map and the backups usually extend to Easton and then on holidays, the parking lot begins at Cle Elum. I haven't driven Snoqualmie Pass for eons because of all the traffic on it since our state became a beacon for immigrants wanting to be "close to the mountains".
Don't move here. Colorado, Montana, Wyoming, Idaho, California, and New Mexico have much nicer mountains. Move there.