My experience comes from continental Europe. Most people I know here switch at least between their local national keyboard layout and the US layout. US layout

My experience comes from continental Europe. Most people I know here switch at least between their local national keyboard layout and the US layout. US layout lacks the characters necessary to write in the local language. European layouts often make it awkward to access punctuation common in English (e.g. you need Alt-Gr combos to access). Many people need to use both English and their local language (and perhaps a third European language!) in day-to-day business, hence the need for switching between layouts.