The vast majority of dealers are completely oblivious, at least here in the east, and in all likelihood the vast majority of the country (maybe some sawdust joints in LV they are not?).
What makes me say this? Umm, the vast majority of the dealers do not even know basic strategy, let alone card counting related things. Furthermore dealers are often cross trained across multiple games. The last thing they would be concerned about are the details of counting BJ. Its like worrying if the 3CP dealer is an expert on HCing.
Furthermore, if anyone's concerned about dealers counting down the table, I'm sure its very difficult, keeping track of everyone's cards, correct change amounts, etc.,