Whenever we've gone to Disney, we just rented a stroller. It was worth every cent!
You have to leave your stroller outside rides, so you don't have to worry about someone stealing your stroller if you rent one or worry about it breaking on the plane, etc... Plus the rental ones handle nicely & are nice & big (plenty of room for a dipaer bag, etc....) to fit in there.
Last time we went, our son was 7 mos & our daughter was 4 & honestly, I had my son in my THING-A-MA-SLING the whole time!---We actually rented a double stroller, but our daughter used it & the extra space was used by the diaper bag, etc... He was in our sling the WHOLE day! We did this 2 days in a row. I thought for sure my back would be killing me within a few hours, but it wasn't. We did a similar thing on the plane too--he'd be in the sling & my daughter would just walk to the gate, etc... & my hands were free to help her and everything.
As for Disney rides, at that age your little one's not going to be able to go on very much. You can do the Pirates & Jungle ones & the Haunted Mansion, Finding Nemo & Peter Pan ones, but that's probably going to be about it. I don't think we did anything else w/ our son.--When my daughter wanted to go on a ride that our son couldn't, my husband or I would take her on it while the other one stayed w/ our son. Obviously, roller coasters, Dumbo (unless you're feeling really gutsy), bumper cars, etc... are off the table.
Hope that helps some! Have a great time & take lots of pictures!!!