Sort of off topic, but have you thought about going to Disneyland in Anaheim rather than Disneyworld in Orlando?
I ask because I am currently planning a disneyworld trip/status run in May, and so I'm currently obsessively reading the disneyworld forums - they've just introduced a new system called fastpass+ which restricts the number of fastpasses (which you can use to skip the lines) to three per person per day, in one park only. Disneyland doesn't have these restrictions - as many fastpasses as you can get per day, the non-Disney hotels are much more convenient, and there are just as many rides, but closer together. Plus they have the new Cars Land, which is awesome.
The Disney forums are full of people who HATE the new system, apparently it's making lines in the parks even longer than usual and basically means you have to plan even more obsessively than usual because you need to plan 60 days out when you want to do which ride. I am wishing I'd gone for Disneyland instead (and the only reason I didn't is because I have now done Disneyland, which I love, six times, and Disneyworld only once).
And I'd suggest if you go to Disneyworld staying onsite at a Disney hotel - the value hotels do not cost that much and there are tons of advantages to staying onsite, including extra hours when the parks are only open to resort guests, and the convenience of not having to drive. At Disneyland there are five or six hotels directly opposite the main entrance, but Disneyworld is vast and staying offsite will mean trecking back and forward each day - and you can't take a midday pool break when it gets too hot!