I broke my foot a couple years ago and I'm pretty sure they gave me the all clear to start running again after 6 weeks (that didn't feel so good though), so I think you'd be fine at Disney at 8 weeks (of course, depends on severity of break, etc.). You'll want to wear good shoes, take anti-inflammatories daily, and ice a couple times a day. Time in the pool will also help a lot. I had a support sandal thingy they gave me to wear that was horribly ugly, but it really did make it not hurt when I walked. I'd probably consider wearing that to Disney if I was going that close to the time of injury.
I'll admit it still hurts occasionally to this day though. I doubt it will ever be perfect. I think it depends on where you break it though. Shoe choice will now be the most important thing in the world to you. And probably a lot of shoes you owned pre-break won't be comfortable anymore. I have to have a really firm sole so that my foot doesn't flex overly much - and the arch has to be just in the right spot. If it's too far forward, it puts pressure on the break spot.