That's why I bought them. Also since my son was young I was planning several SHORT (2 park day) trips. (one last year in October and one later this year)
a 2 day ticket is near $100/day..
My no expiration tickets cost me (purchased last year) around $75/day WITH park hopper option.
Right now a 5-day park hopper costs about $76/day (using
Undercover Tourist pricing).
So at this point, I'll continue to use the no-expiration tickets as long as I can't get a ticket price to an average of less than $75/day. (At current pricing I would need to stay 6+ days to do that!) .. and while I like Disney I would rather have several short trips over one giant one.
I also like the flexibility it gives you without feeling you waste anything.
Want to cut your park days short and have a pool day? Who cares .. your tickets never expire.
Want to take that planned day off and go to a park instead? You already have the ticket in hand (or wrist).
It was a nice perk .. and if I had had children earlier in my life I would have probably stocked up on them and used them exclusively as the way to pay for park tickets.
Even though I knew they were going away, I couldn't justify spending that much money (after already having 8 days left on my current ones) in one big chunk on future vacations (even thought it would probably save me money in the long run).