No worries, mate, you'll have a great time!!
And like Planogirl said, try to have an open mind--if you go with preconceived notions, anticipating disappointment, then you surely will get it.
I adore Disney but I'm equally, if not more so, looking forward to our UNI vacation because life is an adventure! We initially planned on splitting our stay between WDW and UNI, but after doing more research, we've decided to enjoy the whole UNI experience by staying onsite, (HRH,) enjoying the parks while taking side trips to SW, WW, & AQU with our Flex Tickets, like you. (No BG though.)
Yes, there's no fireworks, and I'm hardly an expert, but I think you will have a blast! Kelly Monoghan's book, UNIVERSAL ORLANDO 2010, is an excellent book, and the Unofficial Guide also puts out a BEYOND DISNEY guidebook with sections for SW, W&W, etc, that can help your planning. And, of course, there's tons of info here, like the thread about fitting on rides:
http://www.disboards.com/showthread.php?t=2489210
Also, you might want to purchase your Flex Tickets soon seeing how WDW & UNI's prices have raised. If you subscribe to the Mousesavers.com newsletter, there's a link that takes you to Undercovertourist.com where you can get them discounted. (Flex was $242, not sure how much the Flex Plus was.)
Okay, I'll stop babbling now. But relax, you'll be with your family--away from work--so how can you not have fun!
