It seems Gregtech manages to infuriate me even when turned off! So the server has Gregtech disabled but NEI still shows some Gregtech recipe like the Advanced Solar Panel but others like the Macerator or basic Solar Panel are fine, what's up with that?
Not all the recipes bothering you are set by GregTech, that's the problem. Some mods, like Advanced Solar Panels, have their own hard recipes by default.
The wiki is wrong. Advanced Solar Panels handles its own recipes. GregTech only affects the base Solar Panel recipe (which has a knock-on effect on the other recipes but that's another matter entirely).