Hiya and welcome to the forum.
Like PickledSakura, I too grew up right outside Philadelphia. So I was used to all the big-city conveniences while living in the suburbs. And as PickledSakura stated, it really depends on what his situation was in the States, and where he is moving to here. You said he's a New Yorker. Do you mean NYC, somewhere in the suburbs, upstate NY? Big differences. Where would he be moving to here?
I moved to West Yorkshire, and a 5-minute walk to our town's center. I'd say about 75% of my daily living is the same or very similar; 20% is significantly changed and 5% is radically changed.

The biggest differences, from my American perspective are as follows. They may not bother your man at all, however.
I walk a LOT more than I did in the USA. A LOT. I also carry lots of groceries home every week, rather than us going in the car. Why? Because town is close, I need the exercise and as you know, petrol is a fortune. This was probably the biggest change in my lifestyle. Even though we have a very big "American-style" frig, our cupboard space is limited, so it seems I am always shopping. I used to go 1x in 10 days in the states, or 1x a week at the most. Here it seems I go every few days.
The stores aren't open until 10 p.m. or later in my town like they were back home. That took getting used to as well. The town is completely shut down by 5:30-6 p.m. (aside from the pubs). I sometimes find this a bit depressing as I used to like to shop in the evenings. If your man is from NYC he might find this really annoying. I'm long past the "pizza at 2 a.m." stage, but it was nice to know I could get practically anything at any hour back home.
The minuscule washing machines, smaller rooms and non-existent closets in the home drive me batty to this day. For a family of 3, I have to wash every other day, and even though we have a drier, DH doesn't like to use it, so that means items are always hanging all over the house to dry in the winter. I wasn't used to that *at all* and it still bugs me, but I am getting used to it. If your man has a lot of "stuff" he may find is as annoying as I do that there never seems to be a place to put everything. Again, if he is from NYC, he is probably used to cramped spaces. I wasn't. My last home had huge rooms, cathedral ceilings, and walk-in closets (and was still 1/2 the price of our current home). So I felt rather cramped and claustrophobic when I came here.
Eating out is so expensive! This was another thing that took some getting used to. I had to stop thinking in terms of what such and such would cost in America or I'd have never bought anything.

All that said, even in my middle age I am quite adaptable and tried to look at everything as a new adventure.

I do absolutely love living here and I only really miss the States when I am trying to cram a new outfit into my already bursting-at-the-seams wardrobe.
