I was in your situation only reversed two years ago. We are WDW vets but never had gone to DL, so I get the nerves. It's funny because I know I over planned for DL but had fun doing it, and really enjoyed the trip. You'll be ok, it does take just a bit more planning, but a different type as well. Having to know so far ahead of time which park you want which day is trickier in WDW for sure, as well as ADR's for restaurants you want (esp. if they are popular). For the day-of fastpasses, just familiarize yourself with what we call the refresh method, which just meant that the day you are actually there don't believe it if it says they are out of FP's for the day for a particular ride, just keep refreshing on the ap and see what comes up (this is if they don't change anything between now and when your trip is of course). The other big tip/difference is distance. In DL proper, everything is so close together, but in MK it's spread out, so be prepared for that; more walking between things, and more time to get where you are going. Rope drop is a lot more crowded than at DL as well.
As for FQ, they did do a refurb so the rooms are indeed much more "modern" looking (that's the bland part), but enough of the theme is still there to fit in with the NO vibe. I will say that the rest of the resort makes up for the lack of theme in the rooms. We consider Port Orleans our "home" resort pick, as we love the small size, the ambience, the boats, horses, the sisterhood of PO:FQ and PO:R. We don't stay there every time (and have stayed at every level of resort), but we do keep returning here more than anywhere else. But, the resorts at WDW are so tailored to different tastes, you kind of have to just pick and hope it clicks with you when you've never been before. Oh, and that's another difference with DL; if you have extra time, do travel the monorail hotels at MK to check them out, and maybe even stroll over to the Boardwalk area outside of EPCOT... the hotels are all attractions on their own.
