One of the reasons why I play a whole lot of jazz standards on different instruments is because it builds that feeling of just "knowing" (if I can hear the notes in my head) what I should play. I find "youtube jam tracks" wholly unhelpful, but I spend a whole lot of time playing to backing tracks for stuff like "All of Me" or "Sweet Sue" and playing the melody in different positions/ registers. I have been finding that a lot better for my playing than doing scales (though I still work scales on instruments where I in a learning phase).

But that feeling of "just knowing" is common among a lot of instruments and players.

I know that if I play some fingering on the clarinet, or jut grab a chord on the pedal steel, or whatever it's going to do what I intend without thinking about naming what I intend to do, just like i don't think about spelling, punctation, or letter position when I type (even though I often need to edit LOL).

So I agree- if I am playing bass with folks I will often just start playing without thinking too much about what notes I am playing beyond trying to decide on the general tonic key of the song.