It's not a question of whether you're going to drive hard or soft, it's a question of whether you're going to drive dumb. If you're just going to drive a bit more than optimal speed and not ease off the accelerator when going down hill then a hybrid will still probably benefit you. Just normal driving, even if not entirely optimal you'll get better gas mileage.

If you're going to drive idiotically and drag race off the line at every green light, only to slam on your breaks then nothing is going to help you (although the electric assist will help save gas during acceleration). It depends whether you're going to drive in a way that's intentionally designed to get bad gas mileage, or one that is just neutral.

Keep in mind that the fuel economy gauge has a very persuasive ability to change your driving habits. Just seeing how what you are doing impacts your gas mileage can encourage you to try to maximize your fuel economy. You don't have to be a fanatic about it to benefit from responding to what your car is telling you.

It depends if you come in with a bad attitude or not. If you're just going to drive badly to spite everyone, then I doubt a hybrid will benefit you much. Otherwise, for normal driving I'd say it would be worth it.