No it is not normal; you are weird. Just joking! I, too, use ES5 more than ES6. The thing is that most basic things always are added in lower iterations, so it is normal that you use stuff from lower iterations more often! If there is no need for ES6 things, like a generator function, why would you enforce them? In my opinion, you should just take a look at the features, keep in mind what stuff is new and use it whenever you feel like it fits in.
I guess, for myself, the most-used ES6 features are arrow-functions and the class-sugar. But when I find the need, I also use Symbols for private attributes or today I implemented my first generator function for handling an input flow, which has to wait for promises (or not, depending on the return value of a function).