It's a good point. I know people who are very out and some who are very deep in the closet. The former seem to be much happier and less-stressed in general. (Not to mention, are more able to get dates even.)
I totally understand not bringing it up to coworkers and relatives. That's usually more of a pain than anything. But friends? Well, if they don't accept you for who you are, they're not good friends to begin with, now are they?