Interesting. My experience is the opposite. I seem to always just know where the rudder is with a single. The rudder and throttle are all I've got. Plus I can tell right away if I'm wrong.
OTOH, with twins I primarily use the clutches and throttles. The rudder is more of an added bonus, and it tends to drift out of focus for me. Until I notice an unexpected side force acting on me. Then I have to process; is it wind? current? No, darn, I left the helm hard over!
I've finally got so it's second nature to check the rudder indicator when maneuvering. Maybe I'll find myself doing that when running a single screw next time. I just haven't done that as much lately.