I hadn't noticed this forum before!! I love it!!
No flaming please, but dh and I think you can spoil a dc with too much "stuff",but not with too much of our time and love.
With that said, we have adopted a rule that a friend from my old LLL group passed on.
For each new toy (or even clothing if there's an excess) that enters the house, one goes out. For ex: before BD's, I take dd or ds into the playroom, and they (try) to fill a bag of toys that they have outgrown, or have no interest in, and we give the sack(or box) to charity. I explain how important it is to be generous with people that don't have as much as us. Dd totally gets it, but with ds, we are happy if he even puts 1 thing in the sack.
We also keep a trash bag there too, for broken toys,lost toys that don't find their way back to the original set.
I have turned two changing tables into shelves that store shoebox size containers and other toys.
Seldom used toys or really big ones(like our pop-up castle) gets put in the basement and they can play with it when they want.
I can imagine organizing toys with more dc would be oh so challenging!!