The only thing (presumably) that might suck about hanging out with Alan Moore for me is that I quit smoking years ago and, from what I hear, he mixes tobacco with his...nevermind.
I'd act like an idiot if I ever met Alan Moore. I don't tend to get the "This person is better than me" feeling around a lot of people, but I'm pretty sure Alan Moore would be one of them.
I had a chance to meet John Romita Jr. a while back and was all bumbling fanboy nonsense. A year or so ago I met one of my favorite comedians (Doug Stanhope) at a comedy show here in Baltimore and was completely different. I was very much more relaxed and competent. I think the difference can be attributed to the drink I had in my hand the second time around.
A friend of mine in Boston got me an hour interview/talk with Noam Chomsky should I ever be up that way (his mom is Chomsky's personal assistant at MIT) but I keep putting it off because I honestly have no idea what I'd say to someone so well know who has been interviewed so many times on so many topics. I think a lot of it comes down to setting and casual/formal atmosphere. If you're going to meet someone you could consider a "personal hero" or an influence or inspiration, having a pint or a meal with them makes everything much more relaxed. But a lot of times in the entertainment business these things happen at conventions, signings, etc and there is just too much going on.
Interviews with Alan Moore always gave me the impression that he was a wonderfully nice guy. I mean, his appearance on The Simpsons alone proves that he knows how to have a laugh at himself, so chances are that he's pretty warm and open to anyone who shows him a similar courtesy.
They're good mates and have done a few things together. 'Alan Moore's Front Room' was one of the venues for the limited run of showings of 'The K Foundation Burn A Million Quid'.