Even though i need reading glasses now, I can still get away with not using 90% of the time because I recognize word shapes.
Same with music (not the glasses but the shapes) but with the time element embedded. +10 on the counting. Every musician needs to really play percussion. The Indian (East Indian) method of Konoko - The Ta-Ka-Di-Me-Dun-Dah that the tabla and mridangam players do to vocalize the rhythms are priceless but probably beyond the scope of this discussion .
Doing etudes are fine but remember, jazz rock etc we do phase lock and orchestral players don't. So if you don't want to lose that swing when you are doing Simandl Etudes for example. Set your metronome on 2 and 4 or better a swing pattern drum track loop. Yep -- you need that metronome.