PG - I agree with your take. I don't think anyone would argue against Paul O'Neil however who had a career .284 avg. in the post season.
Brosius had a memorable homerun. Kind of like Aaron Boone imho. I never thought that Tino Martinez was much of a clutch hitter either although he hit a couple memorable homeruns.
Here is how I would rate the late 90's Yankees:
O'Neil
Jeter
Posada and Williams
Martinez
Brosius
Everybody else
Note: (perhaps Wade Boggs should be on the list but he does not seem like a Yankee to me)
Reggie of course is on the all time list but when you do that he pales in comparison to the likes of Mantle, Ruth, Dimaggio, Gehrig, Berra, and of course Bobby Richardson
Lou Pinnela was a pretty darned good clutch player as well imho.
There are obviously tons of post season pitchers and I'll let someone else name them.