same, I usually dont mind waiting but when its busy and Im out with friends I just ask them to pull it straight. head isnt usually too big, it can be know and again...but then again so can the head on the lager. Down to the bar person I guess.
I think this is a theatrical thing as said above. Its so people believe they are getting a better quality pint/product. Which I think they will beleive. Just good marketing.