I find that there are two main drawbacks associated with moving past/getting over something (or someone).
The first is that my head knows I've moved on. But sometimes the less logical parts of me seem to forget that.
The second is that there's nothing to slide into the vacancy. This either leaves me thinking about nothing, which is a complete waste of time, or makes me regress, which leads back to problem #1.
Maybe I should just start singing "Sound of Silence" to myself. Tramp through the snowy park softly muttering, "Hello darkness, my old friend". It might not fill the void, but it might be amusing for a while.