We seem to have very quickly reached a point where the question of whether or not shove is wildly overpowered hinges on experiences I have not had that seem implausible based on experiences I have had. If anybody does have video of their PC getting shoved 30+ feet, that seems like a problem. You probably shouldn't be able to push people more than 5 feet over flat ground. That has been my experience. When you are near a ledge, the game seems to give you a little extra boost so that you will go over the ledge, but I have not seen this happen from the middle of a platform as wide as the one where you fight Nere.
But I am having kind of a hard time just accepting this as an assertion. Generally speaking, I am skeptical of arguments that take the form of "This one time this really crazy thing happened, and you just have to take my word for it, and also you're a dick if you don't believe it, but we should definitely take action based on it."
I mean, you could also provide a recording showing that characters
aren't shoved as far as others are saying. E.g., go to that Nere fight put Lae'zel in the center of that platform, and reload until an enemy shoves them. Then you can measure exactly how far they're shoved. Actually you could do this test for any flat ground with a ledge nearish by, as you do say "the game gives you an extra boost to go over the ledge". Why are GM4Him, fylimar, and Tuco's claims less trustworthy than yours and Jandk's?
Also,
You probably shouldn't be able to push people more than 5 feet over flat ground.
What made me change it to a standard action was actually a combat in that same room. [...] It was very satisfying to kill them with spikes like that, but a bit silly and I did feel like there should be some impetus to try out different strategies.
Seems like you agree with what many people are saying here..? Shove should be an action and only shove 5 feet.
If shove-haters are actually exaggerating distances, then Larian "changing" shove to 5 feet won't change anything and the posters will look silly.
If shove distances are variable and/or you're understating the effects of shove, then you & them will be happy if Larian changes it to 5 feet.