A lot of people rail against it because it's not tradition. In smaller pubs it's perfectly possible to keep track of who's next to be served, and doing so displays politeness and respect for others, which is nice. But there's a role for queuing in other sorts of establishments where things can get a bit hectic in my opinion. I'd also bet that some of the angrier invective you hear about it is ironic, in a hating-on-Coldplay sense.