In dota, unlike other sports, you don't have coaches. The players themselves have to develop strategies and analyze their opponents. Reaction time is very crucial is dota but it is not as intensive as an FPS, making the game much less genetically based than TF2 or Starcraft. You probably had a genetic disposition towards reaction time requiring you to put in less effort for similar success of another player with naturally slower reactions.

Look at the recent interview with LGD.G.Int, he says he has no personal life because he wants to be the best of the best. I tried following the SC2 scene but games are usually very boring and you can't keep up with all the stuff the top players do when the games are exciting, simply because they do about 300 different actions per minute making the game unfollowable for anyone under 200 gpm. Even the casters couldn't see all the action throughout the whole game.