I've never really understood these particular threads (no offense, OP) because I don't know how we can get inside your head if you can't get inside your own.
All I can tell you is that I had a 2006 Macbook and was looking to replace it, and I THOUGHT what I wanted was a 15-inch Macbook Pro. But then when I really considered what I use a computer for, I realized 13 inches was better. And then when I t thought about how much I've bitched about the weight of my briefcase, the Air seemed the obvious choice.
I bought one and I haven't looked back. It's the right choice for the real me, not for some hypothetical "me" who has some hypothetical need for a super high-powered machine. I haven't noticed any difficulty with the Air handling the extremely light Photoshop Elements work that I do on rare occasions. I doubt that it's going to be a problem for me to stitch together a Youtube video or whatever I want to do with movies in the future -- but in my many years of Mac ownership, if I haven't started making movies yet, I doubt I'm going to turn into Steven Spielberg all of a sudden.
It's a lot of money, so I would suggest that if you have deep misgivings, don't buy anything. Just wait until the answer becomes clear to you.