Answer/opinion 1: I'd at least use buses to get to/from the MK. Unless you have your heart set on getting there via monorail/ferry (it's not so ridonkulous a concept, lots of people feel they are "truly" at Disney World when they arrive at the Magic Kingdom that way). As far as the other parks, go with your mood. Handy tip: I know that the Port Orleans buses can be pretty good but they can also get overwhelmed, especially when the parks close and crowds en masse try to get on one. If you think you'd often want to be in the parks until closing, then either consider using your car, OR take your sweet time leaving. You probably were thinking about hauling butt to beat the crowds, right? Yeah, just like everyone else is thinking. Shops usually stay open at least a half-hour/45 minutes past official park closing. This way you won't have to "waste" valuable touring time shopping during the park's opening hours, AND you'll avoid all the crazy "I was here first" "No, I was here first" "Come on, my kid has a lazy eye and a bad foot blister, give us cutsies" crapola.
(Alternate tip: If you're at the Magic Kingdom, and if you have the energy, AND if you don't stink too much from fermenting in the Florida sun all day, instead of taking a bus back to your resort, walk to the Contemporary take a bus to Downtown Disney, shop there or go to Adventurer's Club, and THEN go back to your room. You might want to consider taking long ways home from any of the other parks, as well. If you're at Epcot or MGM, take a launch over to the Boardwalk, visit there for a while, and you can still catch a bus back to DTD and then bus or ferry back to PO-R. You could also monorail over to the TTC/MK as if you had parked your car in the MK lot, then bus home from there. It rquires you have some time to kill, granted, but again, you possibly won't get as swept up in all the nonsense usually involved in getting on the buses at park closings)
Answer/opinion 2: I like both restaurants a lot. As far as leaving the park goes, bear in mind, WCC is fun, but not a character meal. If meeting characters is a big deal at all for any of the kids (or you, for that matter), you'll want to stick w/LTT. What I'd probably do, because I'm evil, is make ADRs at both resturants, try to make the one for WCC at least a half-hour later than the one for LTT, and see how you feel. If you're sick of the parks and know you won't want to stick around after eating, go to WCC. From there, you can always ferry back to the MK and get a bus back to PO-R, OR take a bus to DTD and then bus or ferry back to PO-R. If you're all hopped up on Disney magic and want to ride that dragon, nix the ADRs for WCC instead. It might seem callous, making two ADRs so close together, but on the flip side, you'll probably be making SOMEBODY'S day when they can fit someone in at one restaurant or ther other because of your cancellation. Hakuna mutata, spinning wheel turning round, yin and yang and all that.