I was surprised how much more confident I became after starting estrogen. I felt more comfortable with myself and didn't mind expressing who I was to others. It became rather insane, too, because I went from this programmer profiting off war to a full time college student pursuing medicine in about a year. I'm still surprised by that aspect of my life having so much change, and I attribute that to estrogen giving me comfortableness.
Also, definitely boobs. Stairs periodically make my chest bounce, and as an A cup this is surprising every time I notice.
Cheek fat, too. My face changed a lot from HRT. I'm surprised how much it changed.