Can watching grandmasters' games improve my chess 'thinking'? Can my chess "thinking" (positional, tactical, strategic thinking, etc.) improve by watching grandmasters' games regularly? Of course, this is in addition to regular games/tactics solving etc.

As an example, when learning any foreign language, it's a good practice to watch movies and listen to language as much as possible. 

I'm interested in pattern matching, as my brain is very good at it. I think that by constantly watching high-quality games one can develop knowledge of the best moves/strategies/tactics. 

Has anyone applied this technique or has an opinion on this? Cheers
Chess "thinking" is first and foremost a skill. As such it has to be practiced actively. Passively acquired knowledge will only flesh out what you already can do, it will not improve your chess all that much. 

Of course if you try to follow all the variations of the commentators and constantly come up with variations on your own, you will benefit from watching games, thought the level of these games probably doesn't have much of an influence on the training effect. 

Generally improvement happens outside your comfort zone. If it doesn't feel like you put something into it, you probably wont get anything out of it.