I think it is great that you are a healthy weight and you are working to stay that way through good food choices and exercise. I don't know what the perfect body is, but the healthy body in a good bmi range with good bloodwork etc... Yes - it is worth it. Because you won't have to fight obesity due to poor food choices and a sedentary lifestyle and suffer health consequences. Because you won't be in a panic about going on a trip or a reunion or fitting into a dress for a special occasion. Because you can just enjoy life without worrying about not being able to keep up or being embarrased because of your appearance.
I think that is something I am just starting to "get." I thought thin people were just thin and chubby people like me were just chubby and fat people were just fat and that was that... so I just sort of accepted myself and that was ok... but as I work on weight loss and exercise and watch the thin ones -hey, they make the right food choices/exercise choices. Sure, they eat at McDs sometimes and lounge around sometimes, but it is just sometimes. Not all the time. They also make a conscious effort to exercise to keep fit/thin. I went to a friend's house yesterday and she was just getting ready to go for a run... now this is a thin person who goes to the gym during the week. Yet, she still makes the effort on weekends to keep fit and exercise.
Yes, this is hard to make the effort to eat right and exercise and yes, it is worth it for me!
Don't kill yourself with the twice a day workouts.

I did that in my early twenties and became quite fit quite fast, so it does work, but I think that level now would wipe me out totally! I find now I do an extra exercise routine some days because the days are long and there are so many different opportunities, but it is more like a brisk walk at lunch and then a jog at night, or a swim at night.