This isn't technically an example of addiction, but I sometimes find myself taking the sheer awsomeness of Orbiter for granted. I'm sure other Orbinauts do too.
It's easy to pine for the next cool addon, or ask Dr. Schweiger to add relativity, without thinking about how incredibly hard those things are to do.
In Orbiter, we can drive a car around on Earth, and then take a rocket to Mars, and then come back to Earth and drive a car again. Think of the sheer scale that involves! In what other flight sim can you take off from a runway at night, look up at the sky and see the planets in their astronomically correct positions...and then go to them!
To me Martin's brain-child is an absolute software miracle
:tiphat: