But of course,you have to experience how frustrating to do it by yourself (especially if you're doing a pure-stock save without any plugins and part add-ons) first to the point of giving up just before you will see how awesome it is -- hour-long dockings, navball disorientation, rendezvous problems, underestimation, overestimation, ASAS reliance (spazzing), wrong keyboard presses, orbital collisions, and fuel shortages. You can't enter a planet without passing through the atmosphere (if it has an atmosphere in the first place...)