Yep, the full marathon is the only one that goes into the "park day" hours by any significant margin.
I'd recommend avoiding plans for any super-early-morning activities (PPO ADRs or tours, EMM, EMH, etc) on Saturday/Sunday of the marathon weekend simply because of all the road closures and transportation re-routing, but you can do it if you really want to as long as you leave enough extra time to get there. Disney transportation can be easier than driving yourself at those times unless you know the roads really well, also.