Actually string crossing is annoying when playing really fast passages, esp when crossing more than one string
But usually there are alternate fingerings to fix that. But i tell you, if you play a wagner opera as a violinist you are going to be hurting, even if you are a pro.
And yes, chromatics is probably one of the most annoying things for the violinist. But what is more annoying is being told to play triple piano way up in the stratosphere and make a pretty sound. OMG, ive walked away from so many practices with aching rhomboid muscles and forearm tendons.
Also, in my opinion, second violin music in romantic music is often as difficult as the first violin part due to crappy rhythms and notey passages that are not idiomatic of the instrument. 1st violins usually get the melody, even if it is three octaves higher than it should be.
And quadruple stops have to be rolled or divisi, and if rolled suck donkey balls when you have to do them either fast or up bow.
Never played any wind instruments, i dont think my brain works that way