Having been reminded of similarities, I take a mental step back to examine other possibilities, to take a closer look at my characters and reevaluate the purpose and motivation of the scene I'm working on. There are always ways of altering a scene so that it becomes unique unto itself. The more books an author writes the more particular she becomes. Writers don't want to write the same old thing any more than readers want to read it. Play the What-if game with characters and scenes, just as you do when plotting.
Awareness is the key.
Know your characters and make each one special. Create unusual settings and circumstances that add spark to the plot rather than relying on typical devices.