I think this is the one you are referring to: "I fear not the man who has practiced 10,000 kicks once, but I fear the man who has practiced one kick 10,000 times."
This can be interpreted in a multitude of ways, but I like to have it in the context of this other Bruce Lee quote: "Before I studied the art, a punch to me was just like a punch, a kick just like a kick. After I learned the art, a punch was no longer a punch, a kick no longer a kick. Now that I've understood the art, a punch is just like a punch, a kick just like a kick"
My interpretation is that we've all gone through these three phases in one way or another:
1) how do we do this stuff? ok use an editor... who cares if it's emacs (boy is that tough to learn), vi (huh? what's this context thingy), nano (cool, a menu!) etc
2) learn that there's a whole bunch of gee whiz stuff we can use (hey look, I have this special screwdriver designed to fit around the corner). Proceed to OCD over the pros and cons, figure out special cases etc.
3) realise (hopefully not too late), that actually all these specialised tools are just a means to an end. Use the most appropriate one for the situation; and appropriate here might mean that you use that one kick practised 10,000 times ("superfoot" Bill Wallace anybody?), in the right situation, rather than try to remember than wushu butterfly kick that you practised once (it hits, hero points to infinity! but if it misses, oh boy am I in trouble...).
I think step (2) is where we can start to distinguish those who will make it to (3), and those who will not. In order to be really good, if not genius level, it's not sufficient to just practise 10,000 hours (a Gladwell meme which I'm not fond of, although I understand what Gladwell was trying to imply), but to also understand and appreciate these "tools" (whether tangible or not).