We were there for 3 weeks last Jan/Feb (10 days in the parks). Initially, I booked LL for 1 day at each park and thought we would just wing it the other days with a few LLSP for some must do rides. I ended up booking LL for at least 4 other days and we were able to get a LOT done and were happy with our (my) decision. We are also not rope droppers, except for one day at MK when they were closing early for cast appreciation. And that day we rode soooo many things with no LL.
Of course, it depends on crowds when you go, your preferences, etc. I would also think that if you have young children, LLMP or LLSP would definitely be a help.
Cost certainly is an issue as they are not cheap!
If you haven’t already, I would check YouTube videos that will show you how to use the LL’s to get the most out of them. There are a lot out there, but check out Mammoth Club as Molly’s videos are pretty “user friendly”
Whatever you decide, have a fantastic time!