We have a fair amount of miles, but what we really have is a ton of Membership Rewards from our American Express acct. Our ability to use these Rewards pts., in a meaningful way, has gotten so bad that DH is finally considerering cancelling our AmEx card (& he LOVES this card, it was his before we married!!) We just got a Disney Visa & we already have $89 towards expenses at WDW & I know we'll use them.
My problems with Delta (& now Song) is that we always go to WDW in March, during DSs school vacation. We have to coordinate with the BB coach, because oldest DS stay in Fla. after our trip and flies back with his team. Because it is spring break time, free tickets seem scarce. I also refuse to fly anything but non-stop. So I guess you could say that my demands (non stop in high demand season) are the real problem & that is not really Delta/Song's fault. But my reality is why earn points that can't be used in a meaningful way. I would consider using 25,000 mi./pts. for one way on Song, if it would reduce my flight cost to $112.50+tax. I know its not really cost efficient, but its no less efficient than letting our accumulated pts. sit, unused, in our account.