I am currently on a diet, but it's really a lifestyle change since I am focusing on proper nutrition for the long run this time!
It sure is a lifestyle change. Proper nutrition is a must since people can only survive without food for up to 40 days. 
Absolutely! I was too accustomed to yo-yo dieting and wrecked my metabolism. But I'm glad I have a proper mindset towards nutrition now. It won't "feel" like a diet.
Yes, weight cycling isn't cool. You get excited to lose the weight then you gain it right back!