It is also things like how often you can use class class features like bardic inspiration, giving out two versus three inspirations per long rest is more noticeable. For monk wholeness of body it is both adding to the individual healing and number of times you can heal between long rests. For Ranger the Tireless feature it adds to both the temp hp gained but also how many times you can gain the temp hps per long rest. Sorcerer careful spell it protects charisma modifier creatures from your spells.
For Con it will be 1 hp more per level, sometimes that is lasting an extra round of combat before going to 0.
It will also be things like AC and init from dex. So for dex characters this will come up twice as often as it is for both attacks going out and coming in. Con and Wis can be AC too for an unarmored barbarian or a monk.
For paladins the aura charisma modifier save bonus is for everybody around them so decent number of rolls getting you to that 1 in 20.