Then I was in Brooklyn to watch a show that night, we got out around 9PM and was trying to figure out how to get back into the city, the line that was suppose to take us wasn't running it's normal route, so we had to take one stop into Barclays Center which renamed another line to the line that we wanted to go on. Seemed like the locals knew about this though.
I didn't experience any major delays, but it was more like there was so much work being done that you had to spend extra energy remembering which line was available only one way and starting at which station. Google Maps was definitely very helpful.