On the topic of Alpental lines, here were my experiences this season:
2/5 (Friday): 17" of new snow, but it was very wet, heavy snow. Nothing more than 5-10 minutes, and close to ski-on by noon.
2/7 (Sunday): 2+ feet of new snow. I got in line by 8:15-8:30 for Armstrong, but the lift didn't start running for three hours. Skied almost bell-to-bell, got only 4 top-to-bottom runs in, and I don't think it would have been possible to squeeze in another top-to-bottom run.
2/9 (Tuesday): 2+ feet of new snow. I got in line by 8:30 for Armstrong, the lift started running around 9:30-9:45. Insanely crowded, maybe more so than Friday, got 5 top-to-bottom runs in, but I probably could have squeezed in an addition top-to-bottom run if I was being quicker and stayed a bit longer.
Compared with Crystal on powder days, lines at Alpental have definitely been worse, at least in my limited experience. After the initial rush, I don't think I waited in line at Armstrong for more than 20 minutes, but I definitely had some lines for Chair 2 in the 40+ minute range. Lapping Armstrong after getting a quick lap or two on Chair 2 per
@dovski's strategy is probably the way to go here. I was in some awful lines this season for Chair 6 and Northway at Crystal, and I think those probably maxed out around 30 minutes or so, but eased up throughout the day quicker than the lines at Chair 2 at Alpental eased up.
Again, I feel like Alpental is quality over quantity. Top-to-bottom runs on Shot Six or International stack up against some of the best runs I've skied anywhere. That said, based on my one Saturday at Hyak, if I was living in Seattle I would consider skiing at Hyak on crowded weekends when the snow levels are lower.