To be honest I never imagined I would feel comfortable talking much in crowded public spaces. I remember the first time I was faced with that prospect I came within an inch of just running away, so convinced my voice would give me away with the first words uttered.
Being full time means I get a lot of practice at work with talking but that is largely with colleagues who know me. And in fact I'm sure I'm probably a bit lazier with my voice in their company, but still the constant practice helps and stops me from feeling self-conscious.
Today I was being interviewed by a communications researcher in a busy cafe for about an hour and a half. I don't even know if she knew I was trans. I still feel amazed my voice doesn't give me away to waiters and other patrons, etc. To my ear it doesn't sound like a female voice and yet it's pretty clear it's not a male voice either. This evening, by sheer fluke a friend got on the train on the way home and we chatted, in a very full carriage, all the way to her station - about twenty minutes. Had that happened a few months ago I think I would have been close to whispering if at all, but this was a relax chatty conversation.
It's not that my voice has changed. I can still slip back to guy voice with no problem. It's just that I'm getting better at modulating my tone and volume even when doing a lot of talking. On top of that my confidence is growing to the point where I'm not that conscious of it. Still am to some degree but that seems to be fading.