I think it depends. I started off 345lbs 6 months ago. Now I am 287. I compared pictures to what I am now, to what I was. I know I will never ever go back to the way I was. I think starting off so obese actually does give me an advantage as I see how much better I fit in clothes, and even though I am still very obese, I already notice people treating me better, since I am not quite as disgusting.
I have been doing a "diet" very low carb, and I don't plan on sticking to it if I dont have to. But I have learned self control, moderation, and more importantly, the importance of nutrition.
That's not to say once I hit my goal weight I wont maybe gain back a few lbs. But I have also been going to the gym for weightlifting and actually enjoy it. It is something I will continue doing. Just started C25K and right now I hate it (as I did weightlifting when I started) but I know once I start seeing significant improvements with my running where it doesn't feel like my lungs are exploding after 45 seconds of jogging that I will enjoy it to.
Also when other people who don't know I was focusing on weight loss see me and congratulate me it is such a motivation booster as well.
The only comments I do hate is people saying "oh you're thin!" when clearly I am not since I am still 287lbs.