I think "no one" is an exaggeration. I'm sure there are players who enjoy Geno's practices (Morgan Tuck and Kelly Faris come to mind as two likely possibilities), just as there are recruits who enjoy Marine basic training and law students who enjoy the first year at Harvard Law School. Many people enjoy Outward Bound experiences.
If you can feel yourself developing capabilities that you barely knew you had, and the results are apparent in games, you will have a sense of enjoyment to go along with the exhaustion.
It is the players who thought that they could coast along on their physical talent that have a rude awakening. Another group that may have difficulty are players who are discovering for the first time that there are other players on their team who are better than they are at what they thought they were good at. Saniya may belong to the latter category.