I have a relatively healthy relationship with such videos/images. They don't haunt me in my sleep or even invoke instant emotion like some people I know. When I first saw images of the idustries I cried my eyes out. After becoming vegan it didn't bother me so much - it's not my fault, after all, right? So I watched as many as I could find. I don't know where my activism might take me, but I know I need to be able to control myself no matter what I see. So I got myself pretty used to them. (Systematically desensitized myself, actually.)
However, I do use them to motivate me more now. I freaking have to watch the pig portion of MYM to motivate myself to collect signatures (to ban veal crates/gestation crates) everyday I need to get out and do it. The pig portion bothers me now, because I feel like it's partly my fault - I can do something to ***** slap the pig industry in this state, and so I have to. If I don't than I'm just as bad as a pig eater in my eyes. But the other portions still don't bother me, which I find interesting.
I can't wait to get Earthlings. I need to set up a movie night with my best friend (we're going to have a vegan home when we move in together, but she's not vegan yet and I'm not even sure what she has in mind about it). I have PK and The Witness, Earthlings sounds like it would wrap it up nicely.