Oh I'm aware they can fly on one engine. But those engines will have probably been the same age and undergone the same maintenance schedule, maybe by the same teams and if you're down to your last one....
I'd have been happy down to three engines.
But today it's MAINLY the whole airport experience that puts me off. If I could park at a reasonable cost ... let's say a couple if quid a day (still more than I want to pay for switching an engine off), rock up a few minutes before boarding, hand over my luggage, flash a ticket and get on, LIKE A BUS, I'd be all over that.
On the one hand, I'd rather take the train over flying if I could. But then I don't deal with the hassles that the average Brit faces on the trains so this experience is not burned into my memory. For me the trains are always a pleasant experience. On the other hand, getting around the US is a major hassle, so we tend to deal with airports as a required nuisance. Except for those who drive everywhere (and we are not far from this just because of the # of people in our house who need plane tickets).
So I understand everyone has their own experience, but some of it is also geographically (culturally) ingrained.