Unless it's something like Spring Break... well... even then, you'll have the front of the line access...
I say you could do it no matter the crowds with the front of the line access for sure. Only things you need to remember, a few rides do not take the FOTL such as Forbidden Journey, Hollywood Rip Ride and Rockit, and Pteranodon Flyers.
This is how I would tour... IOA first... and only because you have the front of the line access.
- Standby line for Harry Potter and the Forbidden Journey
- Flight of the Hippogriff
- Dragon Challenge
- The Amazing Adventures of Spider-Man
- Incredible Hulk Coaster
- Doctor Doom's Freefall
- Storm Force Accelatron
- The Cat in the Hat
- One Fish, Two Fish, Red Fish, Blue Fish
- Caro-Seuss-el
(Maybe grab a bite to eat here?)
- High in the Sky Seuss Trolley Train Ride
- Jurassic Park River Adventure
- Dudley Do-Right's Ripsaw Falls
- Popeye and Bluto's Bilge-Rat Barges
Then head to USF... the things I left out on this touring plan are...
- Pteranodon Flyers
- The Jurassic Park stuff besides the ride
- If I Ran the Zoo Seuss playground
- Poseidon's Fury
- Eighth Voyage of Sindbad
- Ollivander's Wand Shop
- Me Ship, The Olive water playground
Once at USF...
- Revenge of the Mummy
- Twister... Ride it Out!
- Disaster!
- JAWS
- Men in Black: Alien Attack
- The Simpsons Ride
- Woody Woodpecker's Nuthouse Coaster
- E.T. Adventure
- Shrek 4-D
- Standby line for Hollywood Rip Ride and Rockit
That is how I would do it and I believe you'll get through a lot of these attractions quickly with the front of the line access...
The things I left from USF are...
- Terminator 2: 3-D
- Universal Horror Makeup Show
- Beetlejuice's Graveyard Revue
- Everything in Woody Woodpecker's Kidzone besides the coaster, I left these out due to a lot of other things being crammed in, but you do have the children so you may like to tour this area more thoroughly. I really like the Animal show.