I am right-handed, right-eyed... absolutely cannot write with my left hand, nor can I throw a base-ball / football with the left hand; haven't tried to bowl with the left -  I fear such an attempt might land someone in the hospital ! 
 
I do have some manual dexterity with the left hand;  I took piano for several  years as a child, and flirted with the idea of minoring in piano at college.   Motor  tasks with the left hand aren't too bad - I can frequently "change hands" when working on antique cars and such.
 
Using my Exakta SLR does not present any dexterity issues.
 
Both parents are righties; my brother is a leftie - the nuns insisted he learn to write 
right-handed during primary school, and as far as I know, he still writes RH, fifty years later.
 
My brother and I are both musicians - he is an organist, I am a singer (bass-baritone / low-brass );  my brother is the creative one, gourmet cook, etc.  When I am conducting choirs, I frequently switch hands in my conduting pattern, for page turns, etc.... doing so does not disrupt the tempo or cuing...
 
Like gb hill,  I hardly feel like I have much in the way of creative ability... at least not in terms of "clean-sheet" concepts.