We got a new kitchen the same time my SIL did.
We did not do custom inserts, my SIL did for a bunch of things and she wishes she did not. Example - the utensil inserts are not efficient to what her needs are. I am not sure what she does - but the spice drawer is not longer used rather she has a stacking shelf from container store.

My favorites in my kitchen are the following:

Double layer sliding utensil organizer. Love this!
Pull out for XOXO bins. I keep my flour, sugar, chocolate chips, brown sugar, and pancake mix in these. Love that flour and sugar are no longer on the counter.
Pull out vertical spice drawer.
Pull out cookie tray divider.

I do make use of the lazy Susan in the corner. I would have preferred the corner style pull out drawers but didn’t have space.

I wish I had the tall vertical pullout/foldout pantry but didn’t work with the space.

Wow thank you for the thoughtful post PP!! Yes it’s a custom cabinet maker. The think we’ll do a few nice standard inserts (utensil, cutlery, trash) but hold off on the others until we get a feel for the kitchen.