QWERTY was chosen for old-school typewriters becouse that layout caused the least issues with letter hammers getting stuck together.
computers were introduced slowly, and most typists already could blind-type on typewriters, so they kept QWERTY to ease the transition, even though the reason for it was removed.
indeed, QWERTY is for germanic languages (german, dutch, english). other language bases had different layouts due to the same reasons, latin languages (french, spanish) had AZERTY.
indeed, DVORAK is more convenient in letter placement from a hand-movement standpoint, but QWERTY is historical.
i have also learned to type with QWERTY, and i dont feel the need to learn DVORAK.
however, there are differences in european and american QWERTY, in the placements of the special signs ( /?[]\;<>), and i often get them wrong on other computers, since i have keyboards that are physically european, but due to having windows set to 'standard' english (american), it keeps resetting the layout to american, even though i remove the layout from the choices (darn you, win-update)