It's definitely a matter of what you're familiar with. As a Linux user I'm able to use the "Compose Character" key (I map the right-hand Ctrl key to it) and then use that to write diacritics just as I used to in my university computer lab in the '90s on DEC VT220 terminals!

It's quite a good system: you press compose-character and then two letters to be combined. E.g. CC/o/" gives ö and CC/a/o gives å and so on. If you don't know the exact combination, you can usually guess within one or two attempts e.g. just now trying to get ç I guessed CC/c/s (š) and then CC/c/c (č) before getting it right with CC/c/,

Apropos of Swedish keyboards, though, when a Mac is inflicted on me, the horrible contortions necessary to get all the usual programming bracket symbols ({[]}) are infuriating. They're a lot less annoying on a Swedish PC keyboard.