I drove from Vancouver BC, heading south on I-5 on Sun Aug 20 morning, stopping at the new Arlington WA Supercharger (only 2 other stalls occupied of 16 ), then Centralia where all 10 spots were full when I arrived but one cleared immediately and after I plugged in, perhaps another 2 or 3 arrived in line. Early Monday 21st am headed to Woodburn OR SC where at 5am all 8 stalls were already occupied, but I was first in line and only waited a few minutes for a spot to clear. Drove ~45min further south of there to watch the eclipse.
After the eclipse we avoided I-5 northbound as it was swamped but we took back roads to Woodburn SC (about 1.5hr drive) - all spots again occupied but again first in line and only had to wait perhaps 5 min max. A short line of 3-4 cars formed behind me but turnover seemed good. Chatting with some other Tesla owners there I heard some horror stories of massive SC lineups in California on the way up here, was glad things seemed ok for us. The next leg was the worst of the trip, just trying to get past Portland and north out of Oregon. We eventually made our way to the 205 and escaped OR but it took 5hrs to get back to Centralia SC where there was one free stall when I arrived (and again a short line started to form after me). Last stop Burlington where only 2 of the 8 stalls were occupied.
Beforehand I was worried about crazy SC lineups, but overall the Supercharging stops were not a problem for me, charge rates seemed good, and I guess I was lucky just staying ahead of the crowd and never really waiting for a plug. Lots of passers-by at the full Superchargers taking photos, having never seen so many Teslas in one spot before I guess. Lots of friendly Tesla owners at each stop too. Overall, the stops broke up the drive, AP1 worked well and reduced the stress, and even though it was total 10.5hrs driving (plus charging) to get home, it was well worth it to experience totality in person.