Listen, i'm gonna be a cast member soon in WDW. And the first thing i doing is buying an annual pass for Universal Studios. I'd buy one first for Disney, but guess what, entrance will be free lol.
With that said, if you're already putting yourself down for visiting Universal, only two things can happen: that it will be a completely horrid experience, or that you will love it because your expectations are too low, anything will surpass them.
Honestly, i believe it's a dumb thing to do. (I'm not calling you dumb, BTW, we all make dumb mistakes every once in a while. I've done two today).
But here's the deal. Disney is pure magic, it's all wonderful, amazing and well, all the adjetives you all know.
But that doesn't mean no other place can have it.
Universal, specially since the opening of Islands of Adventure, has improved a lot in terms of theming and entertainment. Their attractions are top notch (and not just the rollercoasters).
You sya you have a nine year old. Well, Seuss' Landing is a BEAUTIFUL place for the young ones to have fun. I'm 26, and never miss the chance to spend some time with the Grinch. He's awesome. Cat in the Hat is a lot of fun, as are the other games.
Popeye's a lot of fun too. You will get soaked, and get a tummy ache from laughing so hard.
Spiderman is a great attraction (and very expensive, Universal doesn't do cheap anymore). Disney doesn't have anything like it. And that's great!!!
There's many things to do, see and enjoy in Universal. There's a reason why it's becoming so popular, and it's only second to WDW in the world. Go there with an open mind. Trust me, the mouse won't mind you visiting the park across the road.