Oh yeah, I forgot to mention the weather! You're right that the cold wasn't an issue. It was low to mid 30s at the start and probably not much warmer at the finish. I wore tights, gloves, two thin tops, and two hats. I shed one hat after two miles. Somewhere around three miles I thought I was going to be too warm, but either it cooled off or I settled down. I thought nothing about temperature for the last 20+ miles. There was a wide range of gear. I love my thin hat and liked having it on my head and over my ears, but there were plenty of people hatless or with running caps. I find myself now two days after finishing idly wondering when the Milwaukee marathon is. I haven't looked, but I'm starting to wonder.
There is an addiction to it. I didn't feel the endorphin rush after the marathon, but I have after other long runs. As long as it isn't to the point of injury, I'm going to keep rolling with it.