Overrun

Because little berry is an only child, she is pretty spoiled. I've always tried to keep her toys and books and belongings from overrunning the whole home, and I have had a few rules that help me keep the peace: no licensed character toys, because they usually dont inspire any imagination and are just noisemakers,
no toys that require batteries, though she has two of the latter, they get kept on top of the refridgerator for those times I need a real trick to distract her,
And that art supplies/books will be within her reach to play with whenever she wants.
And for a while, it worked. We have a great storage system in place for her toys and she knows how to clean them up because things go in the same place every time-and everyone was happy.
Then I started getting a nagging feeling. Looking around our living room, I thought: 'Wow. She really has a lot of toys.' And I would gently encourage her to clean up, and order was restored again. Then, small toys began wandering away, to this corner and that, a train here, a small marble there and there and there! And one night we brought home one more toy-a small broom& dustpan set for the girl who is ever copying mama's routines-and suddenly our space was TOO full. There seemed to be toys everywhere. I couldn't round them up, I couldn't corrall her things fast enough! I felt crowded and exasperated and she wasn't playing with things I knew she loved.
What I've done to change it:
I picked a big plastic basket and filled it with those tiny plastic animals, people, and other wonky toys. The ones that never get played with or were broken got tossed (which was a lot, actually). That basket goes in the bathroom-for bathtoys, and suddenly it seemed so much less daunting. I culled a few more toys, a few outgrown books, broken art supplies, sorted through each basket of toys she owns to clean/toss/ and make sure things were in their proper places, and voila! Peace again. Those toys are NOT the boss around here any more :)
What do you do to keep your child/ren's toys from owning your whole home? Or do you find them simply endearing?