I could talk kitchens all day.
Sorry OP, another vote for Quooker tap! We got the basic standalone one (plus a separate hot/cold water tap) and couldn't be without it. Proper boiling water and no way you can turn it on by accident!
And a soap dispenser that's built into the worktop - cheap and so worth it for never having ugly washing up liquid on display.
Otherwise, the dual bin system (recycling and household waste in separate containers) and the corner appliance unit that houses toaster, teapot, chopping boards, food mixer etc without them being on show all the time.
Deep pan drawers!! As many as you can.
Nice, slimline matt white plug sockets with USB ports. Easy to overlook but really make a difference compared to the basic plastic ones. And not expensive either.
Slimline cupboards next to oven/hob to house oils, spices etc.
The main thing is layout. Try to design it so that when you unload the dishwasher most things can be put away in only 2 steps. I cannot tell you the joy that this brings! 😁
Have fun!