Well, you've already been told that you WILL get something wrong, accept it.
I've seen some great ideas tossed out. Here are some more:
A real exhaust vent over the stove, not one of those pcs of crap that filter the air and keep it in the kitchen--guess what we have.
Big old garden tub in the master bath--waste of money and space.
2 sinks in master bath or you will never get anywhere on time.
Front porch--6 foot is too narrow, 8 is better.
How dirty do you get everyday? I'm a machinist and part-time farmer. Metal chips, mud, grease, general stinking clothes--that's me. Just as soon as I walk in the house I am in the mud/laundry room where I can take off my shoes and anything else that stinks. This is where I keep my work boots and coats as well. There are hampers there for my dirty clothes. FWIW, somedays the clothes are so nasty that jeans and shirts are removed outside--thank GOD we don't have close neighbors!
We also put in tile so if I'm not really dirty, or only need to remove my shoes I can make it to the kitchen without having to walk on carpet.
Counterspace in the kitchen---like workbenches in the shop--you can't have enough.
Are you building a garage now or in the future? If its in the future, plan for it now when laying out your lot. Mine is 26 x 42. It houses 3 vehicles, 1 Cadet, 3 ATV's, deep freezer, toolbox, sporting equipment, generator, and a 111 yr old IH hit-and-miss engine. I don't do mechanic work in the garage (often) as I have access to the farm shop for that.