My other half is a "feel" player, and he was once asked to describe it. It's hard to describe. Me personally, I think it's a combination of skill, experience, and instinct, all rolled up together.
I've become a huge snooker fan. Being a railbird, it's easy to spot a few characteristics about technique. Snooker players always address the ball, as Jimmy Reid strongly endorsed, before stepping up to the table, but the other trait I see all snooker players do is after the fire the trigger, they stay down. Pool players jump up and shoot to fast sometimes. Some people call that rhythm, I guess.
Another interesting trait about snooker, many of them rest their chin firmly on the cue stick. A lot of Filipino pool players do this as well, and as we all know, Filipino pool players are strong.
Check out Ronnie O'Sullivan's chin.