At last summer's end, I took an 8 day trip that consisted of 5 theme parks and 2 water parks. I was pleasantly surprised to find not one day where I had to wait more than 25 minutes for any ride; this because it was one of the slowest times of the year, in early September. At SFMM, it was the Wed of the week, and very slow. So slow, in fact, that for nearly the first hour the park was open ( 10 am), we were offered double rides on all the coasters we hit: Batman: the ride, Riddler's Revenge, and Viper!
NO KIDDING- at opening we immediately ran to the back of the park and experienced virtually no lines until after 11am. Also, on that Fri, we were at SFMW and, had the same experience on Medusa, Roar, and Kong ( we politely asked to be let off Kong). From now on, all my coaster trips will start the week of Labor Day!!