Having flown a C180 again recently, I know what you mean. Your feet become lazy in tricycle ac and your skills quickly deteriorate. I've seen some instructors use string on the windscreen to indicate yaw. If the string goes left you apply left rudder. Ths keeps your eyes up and outside, very important. After a while you'll get the feel for it and all will be well again. On the ground it usually only takes a sense for self preservation to keep the thing straight. If you relax on the ground when you're moving it'll try to bite you. Have fun with it.