Interesting questions! I remember when my youngest was a baby (he was my first baby who I nursed for a long time), I was very curious about what it would be like to nurse a toddler.
I definitely was easier for us after the first year. That was partly because my breasts are *very* enthusiastic about milk production and they tried to drown my baby. So, for a long time, we had to nurse lying down. DS refused to nurse more than 2 minutes if I was sitting up; he just couldn't keep up with the milk. Also, lying down, he could just let the excess milk run down the "down" side of his face. Messy, but it worked!
Anyway, by about 10-12 months, he could keep up with the milk and we got to nurse everywhere, so that was great. Also, I felt comfortable having him wait a few minutes while I finished dinner or whatever. So for me, the pressure of having to nurse instantly, everytime he needed to, was gone. He did nurse a great deal from 12-18 months, but I guess I just felt OK with that most of the time. The overnight business really got to me, but at 18 months he was nursing almost all night long, and he'd always nursed a lot at night. A baby who nurses as little as yours at night might not turn around and do what my DS did.
Nursing didn't really decrease during the day (we night weaned at 20 months, when I was afraid that I would kill one of us if we didn't get some rest) until after his second birthday. At that time, it decreased pretty rapidly for a few months, then settled into a predictable schedule (before going to sleep and when waking up, with one quick nursing in the late afternoon) that I would have gladly gone on with for another year or longer. But a few months before his 3rd birthday, he started missing nursings all the time, and before I knew it, he was missing whole days. It made me so sad, but happy, too, that weaning was so natural and easy for him.
HTH! Of course all babies are different, but I think the pattern of increased nursing in the early part of the second year is pretty common, so you might want to be mentally prepared for that. They change SO much during that time, they need the extra comfort that mom's comfy lap and warm milk provides.
OK, I though I was done, but I have to add: nursing a toddler is so much FUN! Enjoy it. It really is cozy and crazy and a thoroughly wonderful experience.