I am hoping someone chimes in on this. Spring break is somewhat spread out over several weeks since not everyone gets it at the same time. However, over at the "other world with the mouse" [where I have more experience] I know that the week before Easter and the week after Easter are really super crowded. There are some good crowd calendars online for universal and if you do a Google search in case no one chimes in with info
We usually go in the off season and this year we are planning 2 days at Universal and several at Disney from Dec 28-Jan 5 and I am worried about crowds.
No matter when you go, my best tips for dealing with Universal crowds are:
1. get inline about 20-30 minutes before the park opens.
2. buy your tickets online in advance so you can go right into the parks.
3. dont waste time on sit down breakfast meals since crowds are usually lighter before 11 am .... take full advantage of that
4. download the wait times app for Universal in advance so you know which rides have short / long wait times
5. look over some park maps in advance of arriving just to give yourself a general feel of where things are located
6. If the park closes at 9 pm, as long as you are in line by 8:59 pm, you can ride....so this is often how we do Forbidden Journey since it usually has a really long wait.