Aww, this thread is making me a bit misty-eyed–it certainly doesn't help that I just recently dusted off my old 3DS, only to have its days explicitly numbered 
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The #1 here checks out--as I've mentioned elsewhere, the Wii U was the Earthbound machine for me. This was the first time I played all the way through the game, and probably one of the first times I've actually committed to finishing a long-ish game via emulation instead of just popping in and messing around like usual. This was also a nice little preview of the eventual promise of the Switch, as I regularly switched between "docked" and "handheld" mode.
I had actually completely forgotten about the Netflix app...I guess this was a little more essential than I recalled! Mario 3D World was a really fun co-op game, but I'm not sure if it would do much for me as a single-player experience.
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I'm not sure exactly when the cutoff for this data is, but it must have been a little while ago because I've put about 25hrs into SMTIV in the last few weeks. I had pretty much forgotten about AC New Leaf until I saw this report--I put more time into that game than I realized! This is the only AC game I've played, but it was just the right amount of chill at just the right time in my life. I was reminded of that time I silkscreened a little version of my favoite T-shirt at the time for my villager :)
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I loved Pokemon Moon (It's still the only game in the series that I've finished), which also had a nice chill vibe. Happy to see Link Between Worlds on there, which is probably my favorite game on the console. This was also my favorite Zelda game until I played BOTW, though that's probably not saying much since those are the only two I've completed lol. The story was actually surprisingly touching, too! It's kinda funny to see my little plot skewing toward "multiplayer," since I'm not sure I ever played a single multiplayer mode on the 3DS.
Anyway, despite Nintendo's best efforts these are very much living systems for me (heck, I even set up my Wii U again just this past year!) and I haven't even touched any of the hacking/homebrew stuff for either console. Still looking forward to a lot more fun with these old-timers :)