We literally bought in 2012 for the space!! As a family of 5 we knew space would be an issue in a standard hotel room as the kids got older. Then our once every other year trips grew to every year. Having a full on kitchen was helpful, yet we never full on cook there! We bought more contracts for an Aulani trip and because we then expanded and brought extended family, my son did the Disney college program, and we bought AP. Buying AP was the turning point that allowed us to do a few hours in the park and leave with no regrets. Now my son moved to FL. So I am there almost every month (from NY).
I think the change in park visits was more because of AP. The freedom to not feel that pressure to get your money worth is huge. Having
DVC helped us also do more activities out of the parks and other activities knowing we will be coming back. I relax more on my WDW trips knowing I will be back and can re-visit.
Even with my many visits I seem to always miss the Moonlight Magic events! So even though we have Direct (and resale) we only seem to take advantage of the discounted (slightly) AP purchase.