We took our DD to WDW this past Sept. and she was 23 mo.
It was a great time for all of us and I am sure you will have a blast with your 2 yr. old as well.
Not sure where you are flying from, but we were flying from NH, so our flight wasn't horribly long. I made sure to bring some snacks on the plane for her and we bought her some milk once we passed through security, so we wouldn't have to wait for the drink cart to come around if she got thirsty.
I also brought some new, small and cheap toys with us to entertain her (i.e., travel MagnaDoodle, coloring book, playdough, etc...).
When at WDW, we tryed not to rush around too much with her. We brought her on all the rides we thought she would enjoy and bought her a special autograph book and pen that she enjoyed carrying around and having the characters sign. We brought snacks and drinks into the park for her and stopped at CS in the park to eat lunch.
Have a great time w/ your kids!!