Even for anime that target adult audiences (and thus may have higher level thinking/awareness than perhaps younger audiences), whenever there's a significant plot development, the anime characters spend 3-5 minutes explaining how they discovered the true identity of whoever, how they found out where the real whatever is, or, how they executed their plan so flawlessly..
Why do they always do this?
Do anime creators suspect the audience can't piece together simple plot points? (I'm sure this isn't actually the case, but, still..) Are some anime only meant to be watched casually, and thus, the extensive and frequent explanations serve as "recaps" for the past few episodes?
It seems like the creators account for some amount of inattentiveness on the audiences part, given these winded explanations.
From my experience in somewhat actively watching anime over the past 7-8 years (a total of 30-40 anime series), I've noticed this in maybe 90% of all anime I've seen.
At first thought, an anime that heavily demonstrates this is..
Death Note: Although the very nature of the series is investigative, L and Light spend soo much time explaining how they know just a single piece of information, even though the audience just watched it happen over the past few episodes. In moderation this isn't such a big deal, however, when these explanations occur, it's generally to people who are on the "same side" as the speaker (e.g., Light talking to Ryuk), and so, no further plot development comes from it (as apposed to perhaps, Light explaining something directly to L). So, in essence, Light is speaking to the audience through Ryuk.
In contrast, an anime that doesn't do this (if I remember correctly) is..
Mushishi: This could be because most episodes are self-contained, as Genko deals with a different mushi spirit in a different town/village with each episode.