In the old kitchen, the undersink area was one big clutter shelf with two doors. To get anything out, one had to open the door all the way and stand on one's head. We have an island across from the sink now, so I didn't want cupboard doors that had to swing open. And I didn't really want to stand on my head to get a sponge.
So, we installed an IKEA provided partition and mounted drawer rails to it. So those big doors under the sink are actually drawer fronts. I mounted little holders to the inside of each drawer front to hold sponges, etc. The other one holds the dishsoap and detergent tabs. We can access these oft' used items without having to pull anything all the way out. And no head stands!
In the back, I put a shelf to hold less frequently used items. The items in the back of the drawers have to be low enough to tuck under the shelf when the drawer is closed, but that is fine. The dishtub fits on the left, and the other one holds the drainer.
And just for fun, here is the Before picture: