You can:
1) Make appointment with people at specified exits. For this purpose, you can share map of station using instant messenger apps.
2) Go out of subway at the exit nearest to your destination using map of station.
3) Plan your way in and out of crowded station beforehand and without need for stopping in flow of people and learning signs on walls. Since introduction of MCC, the need for maps of transfers was increased.

*App has partial English language support. You need some knowledge of Russian language.