"A couple of inches" is seating gold. Although I'm 6'1' I've got relatively short legs and legroom isn't much of a problem, but I have broad shoulders even for my height. That means that if I'm in a narrow middle seat I'm spilling over into the adjoining seats, and there's nothing I can do about it. This is why I try to avoid Boeings - they tend to have narrower seats as a rule.

Seat width is something people should be talking about as much as seat pitch.