I’m gonna quote Burke Holland here because it relates so much to me, and will probably to you too:
I got to a point in my development career where the first thing that I did with any project was add jQuery, even if I was just creating very simple projects and samples. I did this mainly so that I could just use the DOM selection utilities. Back in the day of older browsers, this was easier to justify, but modern browsers have this whole DOM selection thing already nailed down for you.
That was probably my biggest mistake, including jQuery for every trivial stuff, even for just a few lines of code, so I wouldn’t have to deal with hassle of selecting DOM elements “manually”. And why should I, when I can just include this little one liner of code and can use all the jQuery magic I can think of? That was my line of thinking and probably was yours as well. Problems arose when I would have to create something from scratch or couldn’t use jQuery as project dependency, I started sweating profusely and when I didn’t it was either banging my head on the desk or scratching it until it bled (not literally).
Every time you use jQuery a rainforest tree dies.