Absolutely this, the more you know the more you realise you don't know. I think the best kind of knowledge is T-shaped - a niche, narrow pillar of a subject you know inside out, and a broad and shallow range of technologies you are at least on Christmas-card terms with, if not competent.
Also, most things correspond to patterns and the more experiences you have (and/or the older you get), the more enriched your mental models become, and the more areas you can apply those patterns to. E.g. there are a thousand syntactic variations of IF-THEN-ELSE but once you know the pattern, you can apply it to anything.
Also, most things correspond to patterns and the more experiences you have (and/or the older you get), the more enriched your mental models become, and the more areas you can apply those patterns to. E.g. there are a thousand syntactic variations of IF-THEN-ELSE but once you know the pattern, you can apply it to anything.