This depends on typist and keyboard; I use Swedish/Finnish keyboard and touch-type, and hitting j four times happens without looking or thinking. Hitting } requires me to lift my right hand from typing position, hold Alt-Gr, press 0, and then go back to typing position.
And yes, typing [\]{|} and so on is inconvenient on my keyboard. I particularly detest the choice of \ over / in MSDOS and Windows path names.
I occasionally use US keyboard layout just to get around these difficulties, but whenever I arrive at some random computer, it will have the local layout.
(This is particularly confusing when going to France or Germany with they AZERTY and QWERTZ keyboards.)
But there's at least one attempt at a nice remapping for dvorak.