But really, they're the light at the end of the tunnel once you've worked your way though the dynamic / weak typing minefield. It took me a lot of Python, Javascript, and Ruby for me to get there, but now I'm way more comfortable on the other side.
The correct type system is actually way more expressive than not having strong static types. Sum types let you combine multiple return types elegantly and not be sloppy. Option types remind you to check for an absent value.
Static types let you refactor and jump to definition quickly and with confidence.
Your interfaces become concrete and don't erode with the sifting sands of change. As an added bonus, you don't need to precondition check your functions for type.
Types are organizational. Records, transactional details, context. You can bundle things sensibly rather than put them in a mysterious grab bag untyped dictionary or map.
Types help literate programming. You'll find yourself writing fewer comments as the types naturally help document the code. They're way more concrete than comments, too.
With types, bad code often won't compile. Catching bugs early saves so much time.
Types are powerful. It's worth the 3% of extra cognitive load and pays dividends in the long haul. Before long you'll be writing types with minimal effort.