I've been around a long time as well, and we also use AMEX points for stays at WDW, though in our case we take it a step further and always use them to stay at Xmas. WDW's own rates are sky high at Xmas and we find value resorts to be too noisy for our tastes in any case, so the SPG no-blackout policy suits us very well.
(And yes, we also like to use the Cash+points strategy wherever possible for maximum bang for the buck, but I haven't seen one of those at S/D for years now. They are much more common for major cities; we do them quite often in DC, NYC and Chicago.)
When we are gunning for points we channel everything through the Amex, including utility and fuel payments and all of our urban travel. I do have a Chase Disney Visa for the discount opportunities, but I don't consider their point system to be worth bothering with for the most part. We'll use it to pay down an onsite hotel bill, but those points are a major PITA to redeem, IME, so I don't make an effort to collect them. SPG points are much easier to accumulate AND to redeem, IME.