When I first started using Sport mode, I too didn't like the abruptness between throttle on & off. Too much clunk. Too much head bobbing.
As I put more miles on, I came to realize that the machine rewards smoothness and throttle control is an area where subtlety will really pay off in the form of a much more pleasant experience.
Try oozing the grip downward from acceleration, and you will experience a neutral zone where the motor is showing no power being used or generated, and then you can slowly enter the band of regeneration and control how much or how little you like in a given situation, much like the finesse you have learned when applying brakes.
I ride in Sport mode most of the time, except when I am either a) hypermiling for range or b) just in a very mellow mood and want to take everything on my ride very easy. Otherwise, I'm pretty much in streetfighter mode much of the time in San Francisco traffic and love the aggressive regen helping me brake. But easing into it with a modulated throttle (except in emergencies) does make for a more pleasant ride.