Don't get your panties in a bunch, operative word was "if." I never said you don't belong; please don't put words in my mouth.
Generally speaking, I worry that all the advanced safety features these serve to allow drivers to be less alert and less cognizant of their surroundings. I also like to avoid striking objects and people in my car, but the good ol' eyes work pretty well for me.
The only way I would suggest a new car v. old is if incentives and tax savings (PHEV) put the cost below the cost of a used car based on cost per mile for remaining life of car. If it is anything higher to buy a new car, unless you like new car smell, just buy used. What is a "significant amount" in your analysis? I've always found it funny how when buying groceries, I scrutinize unit prices to save pennies. But when looking at cars recently "only $1,000 more for new" went through my head at one point. But a buck is a buck, and thousand of them is a thousand, whether you are talking cheese or autos.