I can visualise how I want a piece of furniture to look, break it down mentally into components and produce tech drawings from that. I don't actually see any of this, it exists in my mind in a form similar to the memory of an iso projection. Haven't actually built any furniture for years, though that's due to change - I need a side table in the kitchen.
You'd probably need to try one of the online aphantasia tests to identify if you are visualising that or doing something else.
A book on the brain that I read in the 60's already had a test like this. It went something like
- think of a cube
- bisect it vertically
- bisect it vertically again
- and again, horizontally.
Now, how many pieces have you?
How did you reach that answer, by visualisation or abstract reasoning?
What was it made of?
What did you cut it with?
What colour was it?
Was there any débris when you cut it - sawdust etc?
I could answer that correctly by visualisation or by maths, but faster by visualisation. However, what I "saw" was like the memory of a diagram, devoid of colour or descriptive data.
At school I was good at solid geometry, but when I moved on to matrices at university I couldn't handle them well beyond 3 dimensions, and tensors floored me. Once I started programming in C I had trouble handling more than 3 levels of indirect addressing.
From all that I'd say that I am good at visualisation but only in as far as needed to solve a problem; however, if I need to can fill my mental diagrams with colour, e.g. imagine a black inlay round the edge of a cherry desk-top, although I never see images of them unless I'm asleep and dreaming.