I so find it helpful, I don't know that the deduction makes much difference (I give it all away) but having less stuff in my house means I want less stuff (why buy it if it will end up at the god will anyway?) And If I ever get the garage cleaned out we can put hte car there and then we can save on that way too
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Plus since my family is growing if I wasn't decluttering junk I would be looking at a bigger house, but the less stuff we have here the more room there is for essentials (a bed per person is one essential) I even managed to get the dresser out of my kitchen (declutter a lot of stuff I never used there) and put it in my kids room for the next kid, so even though I don't need one dresser per kid I will have it.