I have to say... in 2003 I bought a 5 day no expiration ticket and I have no clue when I'll ever use the rest of the thing. Now I'm married and it's not economical to buy him 2 days at the gate, because our trips are all longer than 2 days.
Also, I have lost and refound the ticket several times amongst my "important papers/documents" over the last few years.
We even went to WDW in December '06 and I lugged it all the way there, then we forgot it in the room. The thing was, we had already purchased the hopper for the length of the stay, so it was cheaper for us to both add on a day than it would've been for him to purchase 1 single day ticket. Anyway, I don't think I'll use the no expiration again... even if I was a Floridian, I'd rather get the AP. Sorry for droning on and on