Personally, just me now ;); I wait till the P.... willows are coming on strong before adding 'anything' but sugar or syrup (too cold for syrup yet, for me anyway). I've been watching them today, and yes, they are getting something from snow; landing , resting, tongue lapping, and returning to hive (of course, many don't make it back). That's today's observation with Super ;) Hive.
thomas