Response...

And just to give Icelandic a little competition, the English language has this

hippopotomonstrosesquippedaliophobia
which is the fear of long words. Hear it here
Now this is not as long as Ben's word, but definitely more ironic.

This is claimed to be the longest word though
PNEUMONO­ULTRA­MICRO­SCOPIC­SILICO­VOLCANO­CONIOSIS

Which is a lung disease caused by breathing in particles of siliceous volcanic dust