At our (fairly large) company, you can query by team (and maybe job role) but it will hide responses where the sample size is smaller than a set number (I think 8 or 10).

So yes it can be done but people have to actually care about it.

The cautionary tale about k-anonymity (from Aaron Schwartz's book I think) is when the behavior of aggregates is also something that should be kept privates - the example was that the morning run of an army base in a foreign country was revealed because enough people did this with their smartwatches on that it formed a neat cluster.