Double dishwasher drawers. Game changer. No waiting to fill a big dishwasher and taking things out to hand wash as you need them, but still having the capacity for a full load when you need it.
Massive range cooker (6 burners plus grill plate, 90cm and 30cm ovens both with a rotisserie feature - meat cooked this way with the "drippings" falling on the roast veg is fabulous). Also has a warming drawer.
Large double door fridge freezer with filtered water and ice dispenser. Can't tell you how lovely it is to have ice available on request without pfaffing around with ice cube trays.
Integrated bins. Goodness I hated having the bin "on display". Now I have good sized pull out bins and can separate re: recycling.
Cooks cupboard. Stores all my large appliances (food mixer, processor etc) but easily accessible with internal power sockets. It's a bit like the breakfast cupboard picture posted by a PP.
Pan drawers...loads of space especially for large items like stock pots.
Toyed with the idea of a Quooker but given I'm not a tea drinker and DH is committed to his nespresso machine I didn't bother. DM has one and loves it - but she and DF drink copious amounts of tea daily. It's also a shortcut when boiling veg/pasta/rice but not one I felt justified the spend. Very much an each to their own option I think.
I did get a great kitchen tap however. The type with a pull out hose and that has a direct vs shower stream. Brilliant.
Worktops. Granite. Pricy but indestructible and looks beautiful.
Keen cook so was glad I had a (large) bookshelf as part of the design so all my cook books are available in the kitchen rather than previously being on shelves elsewhere.
The only thing I wish I'd done differently was to have a few more power sockets - especially the pop up ones on the worktop. It's the sort of thing you can never have enough of.