We've done everything at Magic Kingdom, and while we won't necessarily do everything on every trip, I don't think there is anything that I would simply refuse to do again if the right opportunity presented itself.
For example, we would, under no circumstances go out of our way or plan to do Swiss Family Treehouse again. But, if we found ourselves in Adventureland, looking to kill 10-15 minutes waiting for an ADR or FP+ window to open, then yeah, we might as well do that versus aimlessly standing around.