I'll say small throttle twists are noticeably more responsive on the Gold Wing than my SAS in Sport. I rode all my Super Teneres in Sport, and always ride my KTMs in Sport. Of all those bikes, the Gold Wing requires the least amount of throttle movement to get a big response.
Some people may call that twitchy, but that definition is far to negative for me. I just say it takes more practice to master the Sport mode throttle nuances.
It's a non-issue in any other mode. I've been applying Dougbug's words trying to use a lot more Tour mode, adding in thumb shifting when needed. That seems to be working well for highway riding. Sport is good off highway.