There are lots of reasons for going to the pub. One of my favourites is cask ale - it's just a bugger to have 72 pints of ale sloshing around at home, and the pub usually does it so much better than I could. I like the sociable aspect of sitting around with friends, drinking beer, inhibitions slowly being worn away, defences slowly lowering. By the end of it, much to my surprise given my misanthropic streak, I feel slightly more human for having spent time with people.
But equally, I love the solitary pint or two. For me, the pub is the third place, between work and home, a public house where I can be at home. But I don't think I've ever gone to the pub just to drink. More often it's to make phone calls, to look for inspiration to write, to actually sit there with a netbook, pecking away at the keys, trying to hit a deadline, or trying to turn number crunching into something slightly less dreary.
Sometimes I like to get really comfortable and take my shoes off. I'd never dream of going to the bar without shoes, but there's something incredibly relaxing about slipping off your shoes while you work, Tweet, or just make plans on the phone. It's not something I'd do in company - that would just be weird - but on your own in a pub, with a pint, shoes off, brain zinging away on a project - that's something else.