lalarukh1992, please forgive me if I’m wrong, but I have the feeling you are relatively new on your journey.
The point is, I was so excited about what could be done I wanted to do it wherever it could be done. I gave little to no thought about whether or not it needed to be done or if it added any value to the page.
As far as parallax goes (I would call it scroll triggered animation, but that’s me) you can see a small dose of it here. Notice how the top header changes when at the beginning of a topic and a few posts down into a topic.
I think another good use of the effect could be having a “full” navigation menu change to a “hamburger” menu when a page is scrolled down. In other words, I don’t think you should abandon the skill entirely, only that it might be a good idea to limit your use of it so you don’t risk it overpowering a visitor’s experience.