The longest wait I've seen this month was about 1 hour for the Studio Tour. All the rides are averaging around 30 minutes from what I have seen. You should be fine with general admission, especially during a weekday.
It will be a waist of money. Transformers and Mummy will be walk on. Most of the wait for Simpsons and Despicable Me will be pre-show. You might have some wait for Studio Tour due to lack of trams running in the off season. But the line should be shorter than the ride itself. If you do the Tour first thing in the morning there should be no wait. If you see any employees taking surveys at the front of the park, take the survey and get a front of the line ticket for the Studio Tour.