I think it's just the way people are today. Planes have never been roomy and it's always been uncomfortable sitting in those seats, and I'm not a large woman. There were rarely, if ever, disruptive passengers in decades past. Passengers always minded their own business by sleeping, reading a book or magazine, or doing work until the plane landed. It's very sad, because this bad behavior affects everyone and costs the airlines millions.
"Summer afternoon-summer afternoon; to me those have always been the two most beautiful words in the English language." ~Henry James