The time savings doesn't matter, just like the time savings doesn't actually matter when someone goes to File -> Save with their mouse, but we still all use a shortcut we learned for it.
It's more about inconvenience that you didn't know you had. 1/3
A little over the top but yeah on a few occasions I tried learning vim, got 5 minutes into it and immediately concluded “time spent moving my mouse around is way too small to make this bullshit worthwhile” and just went back to a normal ide