In addition, my big reason for preferring movies at home is the "Pause" button. I can sit through an entire movie, but my life is better if I can just pause things for whatever needs come along.
(It's funny, I mentioned this to a coworker from the EU and he asked why the intermission wasn't enough for this. I'm still not sure it wasn't part of a joke that I didn't get, but I think at least US movies when shown in theaters around him always have an intermission.)
The pause button is great. One thing that I find as more theaters have a bar out front where you can order a cocktail or a big 20oz draft beer is that I can't enjoy such things because I'll inevitably have to get up to hit the bathroom at some point during the movie.
At home, we can pause for bathroom breaks, snacks, etc. once or twice during a movie without too much interruption but with zero missing of scenes or annoying people as you squeeze back and forth down the rows when you need to get up.
Way back when, longer "epic" films in the US would sometimes have intermissions. I don't go to movie theaters much but I haven't seen such a thing in decades. (With plays, of course it's normal unless it's only 90 minutes or so long.)
I saw a film in Malta around 2005, high end super crisp projection which half way thorough surprised me when it suddenly cut to a (presumably telecined?) battered old 70s intermission title+music reel.
(It's funny, I mentioned this to a coworker from the EU and he asked why the intermission wasn't enough for this. I'm still not sure it wasn't part of a joke that I didn't get, but I think at least US movies when shown in theaters around him always have an intermission.)