However, you've brought up an interesting point. I know everyone just loves the TNG's 'The Inner Light', however it's a prime example of how Star Trek is usually too episodic for it's own good. Picard lived an entire lifetime on an alien world in just a couple of minutes, and even remembered how to play the recorder afterward. And he's supposed to just go into next week's episode pretending like he also still remembers how to command a starship? I don't buy it. I didn't buy it when I first saw it either.
That's a very good example, a life changing experience forgotten in a few weeks. It makes sense from a production point of view, stories get pitched all the time and big changes to the status quo, especially in episodic television can't be made each week by individual writers. Is just the way it is I guess.