They could probably:
Mei Freeze 1.3sec, down from 1.5sec
Mei Slow 0.75sec, down from 1.5sec
Brig ShieldBash 0.5sec, down from 1.0sec
McCree FlashBang 0.5sec, down from 0.7sec
Orisa Halt could get a little less range.
Doomfist punch could deal damage on wallslam inversely proportional to the distance traveled.
And then maybe tone down all knockbacks by about 10%
SleepDart, EarthShatter, GravitonSurge, GravityWell would need a bit more consideration.