Can you use your DL AP's at Disneyworld? If not do you even get a discount?

No, and no.

This has always bugged me. We live in Texas so each are equally as far and the same for us to get to. One year we did actually go to both and loved it. We would potentially go to both most years if there was an AP pass we could get that allowed it. For a company that is so good at figuring out ways to make money it seems like this would be a no brainer and the fact that WDW and DL are different divisions shouldn't equate into it.

I wish!