Check this out. Last week, I couldn't stand my workspace anymore so I re-organized the whole place once again.
Granted I don't own a tenth as much stuff as you and we've only moved in here last year. But stuff was starting to pile up against the walls - behind the desk, a bunch of amps I don't use and such.
Here's the mess, in the middle of which I felt like I was suffocating:
And here's the cleaned up version:
Basically, stuff I wasn't using such as the 88 keys midi controller was all stored in the closet.
Oddly enough, this seems to have the most positive effect on my creativity as I've been writing quite a bit this week. :)