I have had 3D constructions of blocks and tried drawing them from different angles on paper. This is an exercise I did while growing up during summers. Unfortunately there was no actual imagery or mental rotation involved, I just logic'd out where lines must surely go and drew like that.

...

Such tasks include mental rotation and visual memory, both of which I can perform easily.

I'm confused by these two statements. If you can perform mental rotation easily, why was it not useful in drawing blocks?