Probably a little oversimplified, but I like having models for behavior, most especially my own.
I am in the process of being more generally organized, specifically about time. I may get a lot done in any given day, but if I can't check stuff off a list it can feel like I got nothing done. I have this nasty habit of immediately disregarding a task once I've finished it. As in, completely removing it from my mental map. Being able to plan out exactly when I can address stuff that I might not be able to tackle immediately helps a lot with reducing my 'HOLY SHIT IF I DON'T DO THIS NOW I'LL NEVER DEAL WITH IT' anxiety.
Have you read David Allen's book? I have. I think he'd probably argue that the above is too oversimplified. Here's the official version. You'll notice it's a lot more complicated; there's far more energy spent in the "no" parts because those don't actually go away. I also find the "2 minute rule" to be stupid. I use more like 7-10 minutes because if my life were made up of 2-minute things I could play video games all day. GTD's primary benefit is in organization for action. The graph above basically says "only do shit if you can deal with it immediately."