I don't know if Disney will run a van or car out to pick up at another airport, but if you're planning to stay on Disney property for most or all of the week, a rental car is probably a waste of money. If you want a car for a day or two, National/Alamo has a presence on Disney property, and they will come to pick you up at your resort. You can book cars at the Disney property location as you normally would through National/Alamo, or through your favorite travel agent.
We've done the Magical Express from MCO multiple times now, and despite my general dislike for buses, we did not have any major issues. On the last trip, our bags somehow were delayed at MCO and therefore were delayed getting to the room, or at least that's the story we heard from Bell Services at the resort. It is nice with small kids to check your bags at the departure airport (or resort on the return trip) and not have to drag them around from that point. Obviously, not applicable if the flying is do-it-yourself or on an unsupported airline.
Disney front-loads the cost of multi-day park tickets almost entirely in the first three days of your stay. Beyond that, they're dirt cheap, which is a great way to tempt you to stay on property and spend more money. However, on our last trip, we only stayed three days and then departed the property (and the Orlando area) for the remainder of our trip.
Much of the parks haven't changed in many years (or decades), but the "classic" attractions are a draw for older folks who remember them from their youth. Disney has added most of the "new" attractions over the years by building new parks, such as MGM/Hollywood Studios and Animal Kingdom. They've slightly expanded the Magic Kingdom, but in my opinion, the attractions area of Epcot needs some attention. There are the equivalent of several empty buildings which I presume they could repurpose for new attractions without destroying some of the old (but dated) "classics." I believe that they are dumping some money into Hollywood Studios in an attempt to better capitalize on their film assets. Animal Kingdom is our least favorite park, mostly because we think it doesn't live up to Disney standards in concept or execution.
We like Disney World for what it is, and generally speaking, Disney does a good job with execution considering the scale and annual attendance. The place is run mostly with college and foreign labor, and it is entirely fabricated, but the former are well-trained and the latter is usually so well done it's interesting to experience the result knowing that it used to be a swamp.
JKG
We took a cab when I was there in October.
