FX are the herbs and spices of the DJ world and it can be fun too. But you may need to spend the time perfecting the use of the FX. Add them where appropriate, but don’t overdo it and annoy the crowd.
I have seen many DJs using the FX for absolute no reasons or may be they use it to cover up their poor Beatmatching. It can sound very unprofessional and annoying to party goers. However, I use FX for transition between two songs, sometimes it gets me out of trouble when i have to Mix the Songs with different BPM.