There are actually lots of very exciting GP applications! One of my favorites is "Fixing 55 out of 105 bugs for $8 each", in which GP is used to automatically repair code: https://www.cs.virginia.edu/~weimer/p/weimer-icse2012-genpro... . They've also achieved better-than-human level results in antenna design for NASA ( https://ti.arc.nasa.gov/m/pub-archive/1244h/1244%20(Hornby).... ) and in discovering novel quantum computing algorithms ( http://faculty.hampshire.edu/lspector/pubs/GP-quantum-GP98-w... ).

I'll also shamelessly hock here my GP framework for Python, in case you're interested in experimenting: https://github.com/hchasestevens/monkeys