I play split screen on Switch with my S/O. Having a co-op farm is really nice, as we can be more productive without anything feeling rushed. I married Leah the first time, haven't married anyone yet in our second play through.
Farm is largely automated at this point in terms of actual farming, we've got an "ideal" setup with iridium sprinklers, junimo huts, and scarecrows. Growing ancient fruit continuously in the greenhouse year-round, turning it into wine in our basements to sell for the P R O F I T. Also have like 10 fish ponds with various species - the most valuable row producers plus a few species that have probability to drop high value items (e.g., rainbow trout have like a 0.1% chance to drop prismatic shard). Lately been working on the Ginger Island portion of the game for the first time (didn't get to it in the first play through) and... it's not quite as great as I had hoped for. Golden walnuts are a little too grindy for me, and having a second farm is more of a chore as now you have to keep track of cyclical events in both places. Love going in the volcano though.
It feels like the game is amazingly fun, until all of the sudden it's boring. I don't quite know how else to say it, but it goes from great to grind seemingly overnight once you get far enough into the game. I'd love to see a DLC or something with whole new quests and plot lines back in the Valley. Always seemed to me that the region north of the train station/bath house area could be a great addition, and could be absolutely anything. I'm guessing we will not receive any meaningful updates to the game at this point though, since Concerned Ape is seemingly all in on Haunted Choclatier (which I'm excited for).