Keep in mind there's a little disclaimer in the fine print on using your room key for priority seating. It doesn't work on weekends, holidays or special events. I found out a special event at NBA City is "lots of basketball games on."
That being said, dining at USO/IOA/CW is a breeze compared to the feeding trough at WDW. You definitely do not need to deal with that 180-day garbage. Places like Emeril's, Tchoup Chop and maybe even the Palm, you could book a month or two in advance. I've made ressies for both Emeril's and Tchoup Chop as little as a couple weeks out. Places in the parks and CW, we usually just stop by the dining kiosk (one's in CW; one's in US; one's in IOA) and make a ressie for that day or the next day.
You'll love the dining at the Universal area of Orlando. It is so relaxed and enjoyable -- and an amazing value, too, whether you're eating CS for lunch in the parks or Emeril's for dinner ... or anywhere in between
Bon Appetite!