It is certainly better to do some IFR sim flying to keep "current" than to not fly at all over the winter or similar. More routine emergency decision making might be some good use as well.
VFR sim flying might be only good for preparation, like how valleys look from above or runway layouts. But I don't see PC sim "feels and looks" come close to any real airplane. Just compare taxiing in a real C172 versus taxiing on your PC. Or winds, gusts and such. Way too complex for small computers. And you need to have some guarantee that the airplane behavior is similar to the real thing. Only very few sims are technically, physically driven aside from "gaming" and "eye candy". Some are even modeling the passenger cabin experience better than the flying and piloting itself.