Now, I just want to be clear, the martial arts that Goku has been stated to be a master of is Kung Fu (a different style, to be sure than what is popular in american media). It is known (from the voice of experience, having studied this martial art for seventeen years) that submission locks and pressure point is part of the first lessons learned in Kung Fu. They are by no means effective against an opponent of the same school of martial art as they can focus their ki just as you can.
Now, it has been stated that what appears in the comics (and in DBZ cartoons considering that they have been agreed as canon), is what we judge on is based solely on these displays.
Superman has shown in his comics, the ability to scrap effectively. He does no highly skilled martial arts moves (I take this because no one has presented as scan of him performing any kind of maneuvers that one would consider beyond basic martial arts study). He has never been touted- in canon- to be a martial artist of any caliber.
Goku has. Given this dynamic we can reasonably assume that Goku knows every move Superman knows, and we - as intelligent human beings- know what kind of combat ability is needed to become a master martial artist.
Superman knows locks, holds, and pressure point. He also knows how to box. That is it.
Goku knows how to kick effectively, punch effectively, how to focus his ki to increase his own physical strength. This is above and beyond the bevvy of other powers he can unleash.
So, according the logic used of "what's in the comics/cartoons/manga" Goku being a master martial artist simply does not use the locks and holds because they would be inneffective against the particular individuals against which he fights.
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