For a casual player, like me, what are the biggest/most noticeable changes to be aware of for 2.1?

When I say casual player I mean somebody who has "finished" the game. Has gone to every planet, made every science, but never really engaged with the quality mechanics. Understands the basics of circuitry, but hasn't gone into any great depth on it.

Looking at the patch notes it feels like most of what's there is either behind the scenes stuff that you won't notice but fixes things, or are only going to be noticeable for those who push the games mechanics a hell of a lot further than I do!

What from 2.1 will actually make a difference to my gameplay?

Thanks