We have the understairs Cupboard of Doom, it has all the ironing board and mop crap in it.
Then the dining room is our room of doom, the room where things get dumped. It is pretty ok most of the time because there are now storage units on 3 walls and the table in the middle. When it's all tidy it does look quite a relaxing entertaining space despite being a glorified storage room.
There is a crate that school and work bags get chucked in.
A shelf for one son to put all his wierd school crap in. One for letters that need to be dealt with.
Basket for light bulbs, another for torches and string lights, another for envelops and cards, another for candles, one for drawing stuff, one with chargers, one with cables, one with table clothes, one with old phones etc, my media server is hidden in there somewhere. There is a cupboard, basket, or shelf for all sorts of random crap which makes tidying up easier. If an object falls under the category of we need it but not often, then it has a designated destination in that room.
People often suggest that we knock through to our lounge but they don't understand. When we have those boxes of x-mas decorations that haven't made it to the loft, or cases out for a holiday we can close the door on it.