For you, the main benefit of AS status would be the ability to accrue more miles on your NW/DL/AA transpacs. Additionally, you might actually be able to use these miles for reasonable redemptions.

BTW, I just flew DL in Y PDX-NRT-PVG and was pleasantly surprised. Even the 763 on the PDX-NRT leg was tolerable. My only beef with it was that my seat (reclining exit row aisle) couldn't have been any closer to the mid cabin lavs. I armed myself with a bunch of drink coupons, but it turned out that the FAs didn't want them. Also, the NW lounges in NRT have showers now, the lack of which was one of my pet peeves from the days that I used to spend a lot of time on NW.