Most of your readers are not going to go through your story with a fine tooth comb looking to see how many times you showed them something vs how many times you told them something, so I don't see why so many people fuss over it and tell new writers to watch out for it.
Show. Tell. Show and tell. If it works in your story, than that's all that really matters.
You're right that what works, works, and that both are tools.
But the reasons that people chant "show, don't tell" are:
1) Too many newbie writers lay down abstractions, like "He was shocked" or "She was really mad" that do nothing in dramatic terms;
2) Some writers avoid dramatizing difficult scenes and try to "tell" their way around them;
3) Most writers write boring exposition and narrative, and therefore the telling is boring.
So, there's good reasons for the rule, but it's a rule like a Mom telling a toddler to stay out of the street. A Great Big Grown-up writer doesn't need rules like that.
But many idiots in the writing community mistake these sorts of rules for a Theory of Good Writing.
You're absolutely right that normal readers don't give a damn--they just want it to be interesting.
I've become so annoyed about people criticizing "telling" or "exposition" or "infodumps" that
I've posted a number of extracts of passages from brilliant authors telling. These are fun if you care about such things.