Your 1990 Giants pitching staff in a nutshell: 14 different pitchers started at least one game, but only 3 of them started 18 or more games. The Giants used 26 pitchers over the course of the season, the most they have EVER used—ever as in the entire history of the franchise. The 1995 team reached 25, and the 2005 team reached 24. On a related note, the 1990 team also used a record high of 51 batters. So we’re going to sort by total appearances.
In 1990, the Giants finally handed third base and a full-time job to 24-year-old Matt Williams, and the rest was history: seven straight years of 20+ home runs, including four with more than 30. His batting average jumped, his OPS rose to over .800, and his OPS+ hung over 120 for most of the next decade. He gathered his first All Star selection, a Silver Slugger award, finished sixth in the MVP race (some guy named Barry Bonds ran away with it), and led the league with 122 RsBI. And after his 1996 trade to Cleveland (heartbreaking and stupid at the time, but a pretty fine trade in hindsight), he hung around for another seven pretty productive seasons.