O’Brien is a “chief,” Jonas and Cutler hold the rank of “Crewman,” and I think those are the only enlisted personnel who have lines and appear in more than one episode. Starfleet seems ridiculously officer heavy.
Is the enlisted/officer distinction different in Starfleet from traditional armed forces? And where are all the warrant officers?
It’s hard to show the intricate workings of hundreds of crewmen. It’s just not practical or in the budget. Crewmen pop up every now and then if you pay attention.
Someone said Master and Commander can be seen as similar to Star Trek, and it certainly has the same ship command structure. The crewmen play a larger role and they really cover the dynamic. Very much worth a watch with or without connection to Star Trek.