I don't usually use my microscope in general disassembly or reassembly; for that I use a clip on magnifier attached to my glasses that has a lens for each eye so I retain stereo vision.
The microscope comes into its own for inspection, oiling, and hairspring work, where the higher magnification really makes a difference. It's also great for detailed cleaning and restoration on dials partly because of the magnification but also peering down a microscope cuts out all of the peripheral distractions so your total focus is on the job in hand.
I do use a conventional loupe as well but that tends to be for inspection only as I find working without the ability to properly judge distance is less than ideal. Also, I work at desk height rather than bench height (something that I have to sort out as it's not so good for my back) which means that I am above the work, where the screw drivers need to be, so higher magnification loupes (with correspondingly closer working distances) are less than practical. As and when I eventually get a bench sorted out loupes may become a more viable proposition. What I have in mind is to have the working surface more or less at shoulder height when I am sitting upright. This would place the work in front of my eyes not below so there would be no competition for space with tools.