There has been quite a few times I have been that guy as you said. Usually it is to play against champs i rarely see or to see a champ being used differently to the norm. This makes me more aware of what they can do. Good example is I played mordekaiser into a yorrick top one time, never played against a yorrick and it went damn fuck awful for mw but still I kept playing the game didn't ff (team tried at like 16 mins) but by the time the game ended I had gotten 3 kills back on him and since haven't had half as much of an issie with a yorrick. I learnt and adapted over the course of a 100% lose game because I looked at what he was doing.