Spot on advice! One member of our group was able to get the ticket for us all (6 people), but there was only one ticket. Worked out perfectly. I think it is good that Disney issued one ticket for all of us. That would leave two more spots for others.
Just got back and the advice to get to Port Adventures (or wherever the case may be) is solid. I was amazed at how quickly the line got really long (Thank you Disboards!). Its a bit slow going too because the computers they use are super slow. We walked by a bit later in the day (maybe 1:15PM?) and the line was still really long.
Also, I'll point out that Port Adventures gave us tickets that were 15 minutes apart. They insisted that it was enough time to get from one to the other; and it was. Though if I were to do it again I would have arrived earlier for the first visit to be more towards the front of the line for when they started at 9AM. (we had 9AM and 9:15AM) We arrived for the second meet and greet at exactly 9:15 and the ticket taker said "just in time." She was super nice about it and everything. I just don't know what she would have done if we were a minute late or 5 minutes late. I'm guessing it would be fine, but I don't really know.
I'm so glad to have this board. It's not like our vacation would have been ruined if we didn't meet princesses and anna and elsa, but the princesses meet in the atrium where a lot of families saw them and were turned away from the line. That's kind of a bummer. At least Anna and Elsa meet out of sight in Animator's Palate. If we didn't have tickets for that, we wouldn't have known anything was going on.