In 2018 the major features we got object rest/spread and asynchronous interation. Rest/spread is a big feature that I forgot to mention, but async iteration is only useful in a few situations, I'd call it a minor feature.
In 2017 we got async/await, and shared memory/atomics. Only a few fringe code bases will use shared/memory/atomics, so I'd call async/await the only major feature.
In 2016 we got 0 major features. The only things in the entire spec (an entire year of language progress) was Array.includes and an exponent operator (). Both of those are very clearly "minor" features.
So in the last 3 years, I'd say we've had 2 or 3 major, mainstream features, that's very far from "several major features every year". Especially 2016 where there were 0 major features.