Given how bad most people are at pouring beers even from a bottle, let alone from tap, I don't know if that's a good idea.
But then again, I've seen plenty of bartenders completely screw up the pouring process. Just the other day I had a German backpacker behind the bar try to pour my Guinness like it was a lager.
> And the notion of the wise bartender with an ear to lend from the movies I never saw transpire in real life.
I'm surprised that you haven't found any wise bartenders yet. That's one of the reasons I enjoy going to good craft beer pubs. When I used to work in a pub I had a good knowledge of every beer on tab, whenever there was a new beer I'd have a half pint of it so that I'd know what it was like.
I was actually familiar enough with the regular beers that we served that I was able to discern the variations between the batches that came in.