I've accumulated a lot of stuff.
I find that the exciting trip is seeing new boxes, bins and storage items to put it in.
I have to take the minivan and load up, the amount of storage material simply won't fit in my car.
I find I have to spend time looking for things that I know I have, but can't find them "right now", if ever.
I simply have too much stuff.
Throw it out.
If it has more than a trivial value, post it on craigslist or kijiji and if it doesn't move, donate it.
If you know it won't sell just donate it.
When I donate, I like to put in large clear plastic bags so I know what I'm gathering up.