My recent trips were pretty jet-lag free. We flew to the US on a morning flight, didn't sleep, and adjusted our watches as soon as we were on board. We were tired when we got to Chicago, but we just had an early night and woke up fine the next morning, albeit a little tired.
On the way back it was a night flight and I couldn't sleep, which was a pain. So I just stayed up. For about 26 hours! We went to the pub when we landed, got to bed about 9pm UK time, and again, no lag.
Vicky