Gaurav,
You are right that not many people NEED to cross continents. However, there is a REASON why those that do, never use automatics to do it with, and that reason does not primarily involve the poor reliability of automatics when they are pushed really hard.
The primary reason has to with the fact that the driver needs to be in full control of the vehicle and its gearing at all times to make it to the other side of a sand trap or sand dune, or whatever the obstacle happens to be, which is something automatics DO NOT allow, no matter how near or far that driver is from home.
Many people will disagree, but speaking strictly for myself, the fact that automatics are NEVER used in long overland expeditions settles this debate once and for all.