Disneyland often scales back the entertainment during the off-season. The big advantage is crowds are almost invariably smaller in the off-season so you can do more in the same amount of time. An mid-September afternoon on Main Street. Notice the construction wall on the left. Also keep in mind, certain holiday periods can be very crowded at Disneyland including Thanksgiving weekend and most three day weekends.
Hours are usually longer, but attraction rehabs usually still occur.
Because a large percentage of Disneyland's visitors are locals instead of vacationers, weekends are much more crowded than weekdays. This is less so during the on-season, but even then Saturday is easily the most crowded day of the week. But keep in mind certain entertainment runs on the weekends only, so be sure check ahead to make sure your favorites will be running. While the tips above can be helpful in timing your visit, please remember there are many factors that can make the crowd on any given day be abnormally large or small. Disneyland usually runs a promotion where local residents can get in at a reduced price.