What was presented to us during TNG as Geordie-vision never seemed right.
The way it's been described was, that He sees all we see and then some.
So the way I imagine it is, that he sees the entire visual spectrum but in a condensed way. The blue side of the spectrum shifted towards red and the red toward blue to fit in the wider range of ultraviolet, infrared, etc.
Or at least that's how it should have been presented.
A drawback could be that he loses spectrum resolution. Where we can differentiate between a ton of shades of green for example, to Geordie it would just be simply green.
Also "pixel" resolution might be a factor. He had the ability to zoom in at least with the implants, which is awesome, but the picture quality could be like VHS compared to 4K.
That would be to assume the VISOR has inferior visual quality as normal eyesight, which is 1) something Geordi has absolutely no way to know and no basis for comparison and 2) probably not the case, since we know his visor is capble of detecting microfractures and metal fatigue in solid objects and is pretty good at determining the details of those features.
More to the point: if Geordi actually wanted to see what normal people see, it wouldn't be hard to adjust his visor to only show him the visual spectrum within the normal (for a human, anyway) color spectrum. The only reason not to leave his VISOR on that setting all the time is because he would find that way too limiting and likes being able to see such a broad range of detail (who wouldn't?).
And Insurrection is just Insurrection.