Yes, it is true that you will have to work harder with a band that some other WLS, however, the benefits from the band will be so much greater in the long run!
Not everyone takes a long time to get to restriction. I'm on my second fill and have lost 4.5 lbs in the past week. Will I always have restriction from this fill? Probably not since as you lose weight you also lose the fat pad from around your stomach. The nice thing about the band is that you can have it adjusted as needed - like a belt getting loose as you lose weight, then you get it tightened.
I'm also very excited about the prospects of maintaining my weight loss with the band. Remember that the band general sees a 1-2 lbs loss per week, which is a healthy, normal loss. If you go into this believing that it is a lifelong tool, you'll do much better than if you expect a huge loss overnight like with other WLS. The band works with restrict while other WLS also have malabsorbtion as a key to their quick losses, which can lead to other problems later on. Not always, but it is a risk those folks face.
During the first 6 wks after your band surgery, concentrate on healing. There will be plenty of time to lose the weight after that. Good luck with your surgery!