When getting out of a free standing minecart (not on a rail), is it possible to do so without moving (pushing) it at all? If so, how?
Place another minecart in a 1x1 hole within reach of your derailed minecart and just hop into it with a right-click.
(not my idea, shamelessly stolen from Minecraftaddict's YouTube, see his explanation)
Since version 1.3.1, players are moved away from minecarts when exiting automatically, so as long as there is a valid block to stand on once you've exited the minecart should not move.
We kind of solved the problem by placing a block on the other side of the track, so that it gets pushed against a wall, which does not move it drastically. It worked quite well for all users of my train station. The advantage is that it is quite easy to use and thus hard for somebody to break it (this is a big advantage in multiplayer, of course), but you need to cross the booster track for this to work.