I think both camps have something in them worth looking at. On one end, the general rule is to "show don't tell" when it comes to emotion in writing. What this means is that if your dialogue is written with a visible tone then it becomes redundant to add a modified verb to it. To make this clear here's an example of redundancy:
"You're a fucking pig and I hate you!" She shouted
In this case your punctuation is doing your work for you, and that's pretty much what punctuation is for (other than syntax and clarity of meaning ofc).
But now look at the same sentence with a period at the end:
"You're a fucking pig and I hate you."
Now this can be interpreted in a number of ways, and so you might think it's a good time to break out the she-whispered-menacingly's, but again we would likely find them redundant. Why is that? Well, because most characters have consistent relationships with one another that we should be able to pick up through context. Are the two at the end of an argument? Then the above may come across as a flat dismissal of the other participant. Are they friends with a comfortable relationship? Then we can read it as well-intentioned jabbing, and so on so forth.
The point to take away is that if the character's tone or intention is not readable in the dialogue and situation itself, then you might have simply written it sloppily, which creates a reliance on modified 'said' verbs.
The EXCEPTION to this, and the reason I would hesitate to dismiss these words, is when you want to deliberately upset the flow of conversation from what it was, or to create a shift in tone to create an effect.
Let's say the argument goes like this:
"Yeah? Well fuck you, bitch."
"You're a fucking pig and I hate you" She laughed as she hung up the phone.
(Wow these arguments are so deep and varied, I'm such a good writer)
With the use of the new modifier, the angry tone one could have previously picked up, is transformed into a mocking dismissal of the other person. In ways like this the modified verbs can again become tools of tone shaping rather than tools of redundancy.
And to go even further, you can always experiment with your writing style and push standards in terms of how you frame your dialogue. Terry Pratchett famously writes his dialogue for Death in unquoted [size=11]SMALL CAPS[/h] as the only indication that the words are spoken. Similarly many authors use italics to show that a sentence is an inner monologue, rather than 'he thought to himself' and the like.
TL;DR: Modified 'said' verbs are often redundant, but can also be used intelligently to guide or change the flow of your dialogue. Also fuck conventions and what is "right to write", create your own style if you want and fuck the police if you feel you can still make your writing clear and understandable.