I'm suprised Uni is still growing at that rate. (Especially IOA) though I expect much larger gains in the coming years because of potter/ TF/ JP/KZ etc...
Just got a refurb last week, will get a massive upgrade next year. If only the same could be said about Dinosour.
P.S Uni is quite different then it was 3 years ago, I'd recommend a trip back!
Basically what PO4 said but add Transformer:The Ride because it opens in June at Universal Studios. Also, since it is your first time 3 days should be good. (1 day at each park, one day to parkhop/Citywalk/Resort.)
I'm not 74, But I can answer.
June 20th is opening for TF and rumored for Simpsons, but if you go next weekend you should be able to see both soft.
Summer (Likely June) 2014 for Phase II.