Always seems to be very popular with a certain type of engineer. I personally prefer to create much better looking diagrams in about 1/10th of the time using draw.io
I think you got your fraction reversed. Writing down the specs in plantuml will be a lot faster and generate much more consistent results at the cost of memorizing the syntax upfront. It is an investment, but if you frequently have diagrams in your docs and multiple people collaborate on them, then it's really worth it.