There are quite a few Disney World apps to choose from on my iPhone - which have you found to be the most useful for trip planning and during your actual trip?
DH, who is the more computer savvy among us, finds the touringplans.com app, Lines, to be more user friendly compared to My Disney Experience. I had a brief look at them both and I have to agree. It has easy access to current posted waittimes, current actual waittimes, restaurants complete with menus, crowd levels, recommended and nonrecommended parks, park hours, show times, and a whole lot more! Lines is a very easy site to navigate. I found the MDE app to be quite clunky. But that's just MHO.
No comment on the MDE app as I don't want to use that kind of language here!, but for quick reference to our reservation numbers and dining/event times, we like an old app called Mouse Memo. It really is nothing more than a glorified notepad, but it opens quickly and does not require 3G/4G or wifi connection and nicely organizes our reservation info. We still keep it even though it hasn't been updated since 2009. Not the only app we use, but definitely a keeper for us..