I'd have to say this side of things has been a very interesting side of transtioning. I myself have always felt more comfortable in the company of girls/women but since coming out and living openly as a woman, one of the really big changes has been the fact that most of the women I know have quite quickly accepted me into the fold.
I have also made several new female friends, people who never knew me as a guy, and that has been particularly satisfying. I have never tried to hide my past, impossible given the number of people who know me, but there is a big difference in knowing I lived most of my life as a guy and having actually known my male persona.
Like others who have posted, what I love most is the level of intimacy that exists among women and at lunch now, I am mostly with a couple of female colleagues, one of whom is really becoming a very good friend.
With my old male friends, it is still mostly OK but I'd have to agree there is a probably a little more distance than before.They have been extraordinarily supportive and one at least is quite obviously fascinated by what I have done. I'm even thinking he likes me better as a woman than before...

Most interesting though is how the relationships with their spouses have changed. While we always got on well, I would have to say we have gotten closer and I find myself having conversations at a level of intimacy we had never allowed ourselves previously.
I kind of agree that at some stage we have to decide what world we belong to and as someone who has spent most of her life with a very deep feeling of not belonging, it is a huge relief for me to discover that I may be putting that behind me at last. Having decided to live the rest of my life as the woman I always felt was there inside me, I have been really happy to discover how accepting most of the women I know have been. Definitely one of the most positive aspects of my transition!
Hugs
Donna