The SoCal and SoCal Select AP blockout starts that weekend, which can be both a good and bad thing. It means two of the AP levels won't be able to enter the park (reducing crowds), but DLR blocks APs when they think that non-AP crowds will be high enough to keep the parks busy. That is the week when many school districts, include LAUSD, is out for Spring Break. So, I would go with the expectation that there will be pretty decent sized crowds in the parks. It is probably going to be during "peak" Spring Break season, which should mean long hours and full entertainment (although at this point, we do not know when WoC or F! will return from repair/refurbishment).
I would strongly consider looking into MaxPass. While I'm not sure how many more rides you'd be able to do, it does save time and means less walking.
If you're only there for 3-days, I would consider looking into some of the dining and/or dessert packages for the various shows. When WoC and F! return, there will likely be some kind of package. I would not do a parade dining package for Soundsational (assuming it's still being presented during Spring Break) because that parade isn't "new" and viewing spots tend to be available without a lot of wait (unless you want curbside).