Our experience using the Preferred Seating tickets was in early December; not a crazy-busy time, so take that into account.
We had to be in line at the PS podium before 30 minutes before the show. At that time, no one was in the regular line.
The regular line started moving WELL before our line moved. Even though they have umbrellas in the PS line, when not under the umbrella it was quite hot. Normal line was shaded by the building.
We were the last to be seated.
Seating area for the PS people is the "orchestra" section, which means the ground level (stage is higher than you) close to the front. That would be great for just about any other show.
However, Aladdin has one impressive moment where something comes into the theater...in the orchestra section, you do NOT get the best view of this.
And Aladdin has another impressive moment when a certain flying carpet goes overhead...you have a bad view of this as well, where if you were sitting in a balcony you would have a spectacular view.
So, having had the experience, I do not have a single clue why anyone wants this, as it's the worst view in the house, it seems. And for us, we got in very last (the rest of the theater was full when we were finally let in).
AND if you have little kids with you, you don't WANT to be first in (if the PS line gets in early), because that's more time for their bladders to wake up. There's no bathroom in the building! You have to make your way out, let an usher know that you have to leave so they give you something (slip of paper? can't quite remember), make your way over to the bathrooms between the theater and Monsters Inc, then go all the way to the normal seating side of the theater, find a CM (I had to wait for a CM to come back), show them the slip of paper (or whatever), and get back to your seat. So the less time for bladders to "act up" the better!