LOL Good question!
I started 40 years ago as a programmer, after dropping out of university (Geology) , and been in IT my entire working life. You program in English, not in Dutch. All your documentation (pre-internet) is in English. So I am used to spending 8 hours a day in English, and then coming home and switching to Dutch again. At first, that's not so easy, but after a decade or so, I realized I was actually thinking in English and then speaking in Dutch. Nowadays, I dream in English.
And as to the labels, English is about 40% shorter then Dutch, if I had to translate this post into Dutch it would take about 40% more characters. I mean, "gear" is so much easier then "tandwielen". -smile-