I like it because there are actually less expectations for me of how I should behave. I dont have to pretend to be a womanising, lecherous football loving pervert that I often see straight men acting as. It goes without saying that there are exceptions to that. I can just be 'normal', myself, and most people will attribute it to my sexuality but actually, no, its just that other people have corrupted their expections of male 'normality'. I am more normal than they are.
I also like being able to explore different sides of me, feminine and masculine. It would be much harder to do that and get away with it were I straight. I also enjoy the freedom to tell offensive jokes about this minority we belong to. The shock turning to laughter on people's faces that a gay man would tell such a joke is great.
Plus, I like being fabulous!