I like to use RealFlight to "warm up" my thumbs before I go flying -- particularly if it's been a while. I notice that I tend to have "dumb thumbs" for the first few minutes of each new flying session so I've started using the sim for a few minutes before heading out to the flying field. This gets my head and thumbs back into things.

How about you? What do you use your sim for -- once you've basically learned to fly?