Lots of it. Buckets of it. Actually, I have three boxes of stuff that I keep for sentimental value and one box of old clothes that I refuse to give away because I wear everything in it about once a year.
I go through minor stages where I'll have stuff gather up to a point where it starts to bug me, so then I go through it and throw stuff away. But it's nowhere near a stage of something like hoarding, it's just being busy and not wanting to go through stuff.