Remove doors.
Place horizontally.
Use a good quality satin finish in white, barley white, whatever.
Use a good brush which is also large.

Yes it takes time to do, but with a good quality paint it will last
10yrs+. Just ensure the doors do not butt-up re abrasion wear, leave a
gap.

If you want exceptional "enamel-look" use a sikkens gloss & onol.

If they are getting dusty, close-in the *rear* with a panel of foamex,
hardboard, MDF, anything. You can buy louvre door dusters which
basically drag across each one and pull the dust out.

With the right finish, colour, they can work very well - better than
many nasty foil laminates with edge showing.