I tried this for our dates for POFQ (peak times) to see if I could snag a deal and here is what I determined:
The Orbitz room rate is advertised at 278/night on average.
I used the 10% code and it reduced it another 194.00, bring it to 287/night average
including the tax. So overall for a 7 night stay, I would only save $75.00 if I buy my park tickets separately as well.
I think the tax with Orbitz is much higher than with Disney directly as with Disney you are booking a package price. Maybe I'm wrong, but those are the numbers I get which amounts to less than 5% in savings overall.