Bezie gives you finer automation control in many DAWs, but not all. I don't think you'd gain anything from Bezie in FL Studio. Aside from automation, Bezie also allows you to connect a MIDI controller and trigger Bezie automation for use with DJ software [1] like Traktor.
[1]: https://www.youtube.com/watch?v=DBM5gAm83ao&feature=youtu.be...