Wiggo is 6'3" and apparently gets on with 170mm cranks (I think he used to ride 175mm). Point being, at least one really tall dude has no problem with shorter cranks, YMMV.
https://www.youtube.com/watch?v=Vl3xgFw-u8A

I've nothing to add personally, I'm a short 5'7" and ride 170mm.