I was just there yesterday and Monday. I arrived Monday at 11 ish and it was busy but not insane. Mummy had a 30 minute wait, minions were at 60, gringotts was at 60 and transformers was 50. I did ride using single rider lines. Then I did some browsing and relaxing. Tuesday I got up and went at opening. I got to the turnstile for universal studios at 8:40 and people were already in. I was able to ride with no waits everywhere except potter until 10. Then I shopped and enjoyed potter until 6 ish. It was packed heading out. The crowds were crazy by then.
I would say get there early for the big rides.