I think it's probably a good thing. It just shows pride in your work, I guess, and you should be proud of it since you've put a lot of time and effort into it. Also, all those things--songs, writings, videos, are personal things and so going back through them probably is a way of getting to know yourself a little better. I have a friend who makes videos and as for me I used to write a lot and we both go back through old stuff of ours often and pick up on things that we hardly noticed or thought about while we were actually filming/writing it. I think that even if it is a little excessive it's better to be overly comfortable with reviewing your old movies/writings/songs than to avoid it altogether.
But what do I know?
(I know you hate Lord of the Rings, so I put this name for kicks)