I went on Tuesday night, and the Reed Rd lot was really nice. I showed up around 7:30, got a good parking spot, and there was no wait for a bus. After the concert, you had to wait about 15 minutes for the buses to get stationed, but after they were the line really flew. The line after the game looked exceptionally long-- I thought I'd be there for hours, but it only took about 20 minutes. Very fast, and it took no time to get out of the Reed Rd parking lot afterwards.
Enron Field might be a good place to park too, but I didn't try it...