One thinks one doesn't use "one" all to often, but one discovers one does so frequently.
I don't think I use "one" all that much when I speak, other than "det skulle man kunna tro" ("one would think that'd be the case"). When I wrote my Master's thesis last year I employed it somewhat frequently, for example "man kan konstatera..." ("one can conclude...").

To me it just sounds like Persson being Persson, though.

"The basis of optimism is sheer terror" - Oscar Wilde