The bars I hang out (no pun intended) in, if I'm standing next to another guy at a urinal I'm just happy if he's not so drunk that he's pissing all over my feet!
But honestly, I don't give a shit if somebody's checking out my Johnson; besides I tend to just pull it out and let it hang down by itself when I piss, so I guess that gives an unobstructed view. I figure most guys, gay and straight, sneak a peak anyhow.
When I was much younger I'd get a little wierded-out when another guy would actually comment on my cock (although it doesn't happen all that frequently), but now I just take it as a compliment. Then again, I seldom go to gay bars.