6 years ago I tried relaxing and listen to smooth jazz or something. Being in the moment and just observing my surrounding with hyperfocus was very pleasant. Time felt infinite. Time was now. I have these lapses every now and then, but I wouldn't have it as my new normal.
Without your thoughts you only your body, an animal. Language is what expands human sphere of influence beyond what we see, taste and feel. The "Noosphere", if you will [1]. I don't find internal monologue counterproductive, it's how I explore the possible and impossible without moving.
P.S An honest thanks, I wouldn't have discovered my own thoughts on this subject without an invitation to dialogue in the form of your comment. Language takes two :)