As someone who also recently joined an all haskell team, but hadn't coded professionally in haskell before, I'll add the biggest thing I've noticed to the "how it feels" list:
On a biweekly basis I'm shown something new causing my brain to melt, leak out of my ear & pool onto the floor near my desk. It's awesome[0]!
Today's was using impredicative types + `$` has a special case for dealing with it[1].
[0]: ...some number of hours later when I've collected my thoughts and think "OHHH... duh" [1]: https://ghc.haskell.org/trac/ghc/wiki/ImpredicativePolymorph...