I think it's a package where, you can do without it---and yet, if you do get it, you won't regret it.
Several years ago, I thought very little of navigation systems and rear view cameras. But today, now that I've got them, they're firm dealbreakers for me in any future car. If a car doesn't offer a good nav and/or rear view camera, I won't even bother with them.
Stuff like blind spot detection, lane assist, ACC---they might not sound like anything you'd think would be very useful, but the impression I've gotten from those here that have used them have had only positive things to say.
As others pointed out, you should just take into account--how often you drive, is it in your budget, how long you intend to keep the car, and the added value having such a package will ultimately be down the line.