Well since I have a pass and I always renew, All the months that are not the summer months never seemed to be that bad for me, because the summer is soooo bad, and beleive it or not, when people walk aroung there in the Hot summer it makes it worse, they don't think, they make pushng a stroller harder, i think the sun gets to them. Schools out here, traditonal ones are usually out middle of Jun and back by end of Aug/start of Sept, then year around are off then on, depending at the tracks the kids are on. I like the fall months and the early spring months for not so busy,
Disneyland can let you know, if you tell them you want to vacation in less crowds, when i have called they have said to me, that wednesday are less busy out of all the days, but that might be just one persons idea. Some rides have single rider passes, so if your party doesn't want to go on a ride and only you do, then ask for a single rider pass, you just get on and get off, no waiting. Plus there is stroller swaps, so you can stand in line and the person watching the child in stroller can go right away when you get off, with the stroller swap (that you will ask for before they get in line). there is alot of ways to beat the lines and make time. Also if you get a fast pass you don't need to be back at the time it says, they take EXPIRED fastpass tickets, as long as it is for the day you got it. so you go and get your fastpasses and look when your aloud to get another, get another one and if your on the other side of the park, no worries, they will always except them even if they are expired, just don't arrive early. Hope that helps!