The first thing I would suggest is to eliminate redundant dimensions and labels. In your example that would eliminate at least half of your work of dimensioning.
Since you know this and you’re the one drilling the holes, there’s no need to put the 10 cm dimension in the drawing at all. You can create a drilling guide to use in the shop so you only need to mark the distance from the end of the panel or the centerline on the end of the shelf. That would save you more time.
I do furniture design and plans for a professional furniture maker. We came up with a list of things that are just understood. When he puts dadoes or grooves in panels as you might for shelves, he always uses the same depth. I know what that depth is and model accordingly. When I create the plan for the project I only need to dimension to the edge of the dado from the datum but I don’t have to give the width or the depth because he already knows that.
I wouldn’t bother modeling the holes in the ends of the shelves. That would save time. Since those holes are likely always going to be centered in the thickness of the shelves and 10 cm from the edges, I wouldn’t even bother to dimension them on the shelf. I also wouldn’t bother to make the holes on the side panels. I’d locate them with small centering + marks which could be components that get dropped onto the face of the panel.
Also make sure you avoid conflicting dimensions. Put in the important ones and leave out the rest.
I would do the dimensioning in LayOut and only show what is needed. It’s easier to control the dimensions so they can be read and you can use break lines to show the components where there’s information to relay and eliminate the model. This is from a project I’m working on right now. It’s not complete but you can see the center region of the part is not shown. There are no features in that area so it’s dropped out. The component is still its full length in the SketchUp model, however. This is for a plan for others to build from so it has more dimensions than I would put in if it was just for myself to work from.