As for energy costs, in MN homes are very well insulated, you frequently have a fair amount of trees providing shade, and you have a basement that's 30-40% of your sqft, so heating and cooling costs aren't quite as dramatic, even when it's -20F like it will be this weekend.
Who does the cleaning, you or your partner? I never got used to cleaning a larger space. It is definitely a huge waste of time, vacuum bots only help marginally. Also annoying is walking or especially moving something from one end of the dwelling to the other.
Went to an open house once in a huge ranch. When we decided to leave, I noted how long it took us to walk from the bedroom to the front door. Man I'd hate to dash back in the house "really quick" for something I forgot. I guess that's a first world problem though!
Honestly, the two biggest rooms in this house just store stuff. I can absolutely live without that space. I do enjoy having an extra bedroom to use for... fill in the blank. I bought my house as a foreclosure for 125k and now Zillow lists it for 235k (a bit inflated). The value of my house is about the down payment on a house in San Jose and what I paid is half that.
I have a 2900sq ft home in Texas and we spend next to nothing on heating and AC. Our electric bill per month averages around $160 and peaks around $200 in the summer when we run the AC a bit harder. More than half the expense there is all the electronics in the house, primarily: kitchen utilities, computers, and large screens.
But as already said by others, you fill the space and get used to it. There are times it's really nice to have so much space (holidays with family, birthday parties), and other times it's not (cleaning, a/c). Having a dedicated movie theater room is nice too.
I lived in a 600 sq ft. mobile home in the bay area with my wife and son. It was a bit cramped but not too bad. Now we're in Munich in a place that's...maybe 900 sq ft.? And it feels like a pretty good size, just wish we had a garage. 4200 just blows my mind. To me, I think having that much space would feel like a burden.
But, you are right, this much space does feel like a burden frequently, which is why we are moving and I plan on downsizing. A little.
Of course, it wouldn't take 4x the space we have now to get all that, but I definitely get it a little bit.
tools & supplies for a variety of hobbies that involve the physical world. guest bedroom(s) for visitors. a decent kitchen so two can do real cooking at the same time. book cases. a laundry room that doesn't involve limboing under ducting.
I'm somewhat pondering an Evil Scheme where I start a one-to-one "subcontracting" firm, where a plain-bad programmer who would never otherwise make it in a startup environment can hire someone [me] to do all their work for them—and maybe even guide them through their interviews with a concealed earpiece. Basically, the company would have "actually" hired me, and the person in the startup's office would just be serving as a human proxy for my skills.
Of course, that's effectively just a hack to get around the idiotic policies companies have against hiring remote workers for local salaries; and one that would cost quite a bit of salary (the proxy would still have to get paid, after all.) But I bet it would still turn out better than a non-Bay-Area wage.