I had Sport on for a couple of years and didn't hate it. At the LR Experience course, the instructor told me to pay close attention to the truck for a week or so in Sport then take it out and pay attention again. I found that mostly the difference was that in Sport it shifted at a slightly higher rpm and cruised at a higher rpm (like it wouldn't shift into the highest gear in Sport). Fuel efficiency was down slightly in Sport, and responsiveness in non-Sport was certainly adequate. That analysis caused me to stop using it all the time. When I'm in the mountains I use manual a lot, but when I come out of manual I go back to non-Sport.
Someone who is REALLY attuned to their vehicle might find it to be better or worse in Sport, but I didn't find that it significantly changed my experience.
David