I usually let it thaw in the normal part of the fridge overnight (in another ziplock bag in case the bag leaks) but if you want to warm it up quickly, you can put the frozen milk in a cup of tap water for 15 minutes and it'll fully thaw out. You can then transfer into your feeding bottle and warm it up.
I wouldn't recommend 'crushing' it as it may break down the milk even further and you might lose more nutrients that way. Freezing and thawing already reduces the nutrients in the milk, we don't want to lose even more, as like you said, it's liquid gold.
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Mama of 1 playful lassie