The first is that I have learned how to read again. It is amazing how much the iPhone, internet, youtube and binge TV has wrecked my attention span. I'm not back to my old ability to spend hours with a book, but I'm much improved. I think the 'win-win' nature of being entertained while practicing a skill has upped my perceived value of spending time this way.
The second is that I feel much more confident in social situations now, because I know I am at least adept at using my vocal cords to communicate complete sentences. My vocabulary has also improved - I think for years there have been plenty of words that I knew but was subconsciously afraid to use. Now that so many advanced words feel more comfortable coming out of my mouth, I find they come to me easier in conversation.
Another thing is that I feel smarter and sharper. That is probably because I am back to reading books again. I also feel like this is a virtuous loop, reenforcing the other benefits and the overall habit.