When are you planning to go in the snow? I am assuming you're referring to the Main Trail/standard route?
I've climbed Whitney in no snow, partial snow and 100% snow. Sometimes "a" route is not too hard to ascertain particularly if others have been there before you, but as others commented above, caveat emptor in following others footsteps.
Other times it was very difficult to locate any route, like right after a decent snow, and I've turned around in those conditions, twice. Maybe with a route in a gps and more time, it would have been fine, but I guess I am more conservative.
I'd say if you had trouble routefinding the Main Trail in dry weather, think twice about doing it in the snow by yourself and go with someone who's done it before. If you did the Mountaineers Route, then yes in some spots the route is hard to find and some missteps might have you off a cliff, especially at the beginning near the ledges.