It's a good technique but one that can be abused. As most techniques. Using it as a tool to funnel the group into the content that has been prepared regardless of group strategies is one of the worst. In such cases I'd be much happier and excited if the GM comes out and says only the ogre path is prepared.

I would also like to divide the quantum ogre into two parts - the quantum obstacle and the quantum reward. Quantum obstacle being that regardless of path A or B the same encounter will happen, like a group of ogre bandits. The quantum reward being that regardless of path the same reward waits for them. Like they went after the ogre warcamp instead of the orcs' and found leads to the greater conspiracy. Same leads that would have been in the orc camp. The quantum reward I love to use as it keeps the game going forward, as each (equal) path leads to the same rewards there is no need to do multiple.