in addition to some of the options already listed I like to do one more thing.
If you select all the pens in the first column and set them to .1mm
all the pens in the second column and set them to .2mm
all the pens in the third column and set them to .3mm... so on and so on for columns 1-9 so you can know the pen weight of any pen in these columns just by looking at its pen number.  The last digit of the pen number will be the pen weight.
Pen 135 will be .5mm, 121=.1     247=.7    152=.2   etc...
I set column 10 to .01 mm so I have a hairline in each color as well.
I set all the rows to a different color, the top row to black.
This way I have a pen of every size in any of the row colors.
Most plans only use a few black pens for the top row. 
The advantage is that I always know what size the pen is just by looking at the number.  And I can can have that pen size in every color which helps in sorting things and making things visible.  More importantly for me is that when I set to mm it gives me a reference to something I know.  Remember the Pentel leads we used to use?  They came in .3mm, .5mm, .7mm, .9mm.  There was a time when we had to set up our ArchiCAD pen sets to match the pen plotters which were also in these same familiar sizes. I have no intuition for Pt pen size.  The other 1/2 of the pens I never use except I do use a white pen and also the grey pens.
					
				
			
			
				
	ArchiCAD 25 7000 USA - Windows 10 Pro 64x - Dell 7720 64 GB 2400MHz ECC - Xeon E3 1535M v6 4.20GHz - (2) 1TB M.2 PCIe Class 50 SSD's - 17.3" UHD IPS (3840x2160) - Nvidia Quadro P5000 16GB GDDR5 - Maxwell Studio/Render 5.2.1.49- Multilight 2 - Adobe Acrobat Pro - ArchiCAD 6 -25