How to properly manage videos between iPhone - iPhoto - iTunes

Maybe Im going about this all wrong, but this is what I do. I take pics and videos on my iphone. Eventually I plug it into the computer and iPhoto asks me to import. I select all the items I want to import so all gets put into iPhoto.

iTunes is a different matter. A few months ago I saw my iCloud account was full. So I realized that I could back up my iphone to iTunes and then import everything to iPhoto and after importing, tell iPhoto to delete those videos and photos from my Camera Roll. No big deal cause its all imported into iPhoto. Not only that but now my camera roll was not so full, so my iCLoud was not packed.

However I notice that videos are not backed up. In other words, when Itunes backs up my stuff, what I mean is, all my pictures get moved out of Camera Roll and into an album, such as Last Imported or any event that I created for it. But only pics are present, no videos. Thus I have to go to iPhoto to view my videos.

I guess it makes sense, otherwise my iphone storage itself would fill up quite quickly.

Is this the best way to manage this?

The one thing that worries me, is that now my MBA is filling up and I have this 27GB .... oh wait, its a 27GB iMovie file! Man Im confused...