I was talking about shaders like SEUS and Continuum which are the type of shaders people usually intall Optifine for. They are notoriously demanding especially when used with already heavily modded minecraft. I have a pc that was pretty top of the line 2 1/2 years ago and wouldn't want to run a shaderpack plus a large modpack on it without Optifine.
As for the super secret settings, spider vision etc you have never ever needed Optifine or mods for those things so why would I be referring to those sorts of shaders? Sounds like you're the one who doesn't know what they're talking about.