Brent, are a few observations.
You said, in two different places:
"I'm usually enjoying or doing other things that aren't on my NA lists."
"As soon as an NA hits my NA list, it goes clear out of my head."
Based on these two statements, it doesn't sound like you're getting everything out of your head. The fact that ideas or responsibilities leave your head as soon as you write them down is a phenomenon that makes GTD so wonderful. Your mind on some level trusts that because you wrote it down, it doesn't have to worry about it any longer, so it drops it to think about other things. But that relief is only going to last a short time if you don't revisit where you wrote it down; if you don't, your mind is going to stop trusting that when you write something down, it no longer needs to worry. Checking your lists (once a day, at least, if you are in that context) to see what needs to be done and then getting it done is what will keep that trust level high.
I agree with others that your contexts seem to not be as well defined as they could be. To follow up on others' comments: Go to [someplace] isn't an anywhere context; it's an errand. I guess you could conceivably say that no matter where you are, you can drop everything, hop in the car and drive to the DMV, but if that's true, then isn't that true for everything you do? Follow that through, and "Gather clothes for frisbee" could be an anywhere thing as well, because even if you are at work, or in the car, or at dinner, or anywhere, you could stop what you're doing and go home and pack them. I use anywhere primarily for thinking things or brainstorming, because that's truly one of the only things I can do anywhere, without any equipment or tools or gear or people, etc.
The other two are definitely calls, not anywhere. Same thing applies. Unless you narrow your Calls list down to just calls, and put all calls there, separating things out into these other contexts probably won't be as helpful.
I suspect that one reason you aren't looking at these lists is that they don't accurately reflect your contexts. Your mind doesn't need to or want to look at the Anywhere list, because it isn't really an anywhere list: it's a mishmash of other things. Your mind doesn't want to think (strangely enough). The beauty of grouping NAs by context is that you do the thinking up front, at one time, and then spend the rest of your time doing. The thinking requires that you identify exactly what the next physical action is, decide where it is that you can and should do it, decide what tools or equipment you need to do it, and then record it accordingly.
One thing I did once to help me solidify and clarify my contexts was to physically put the context lists in the places and by the gear that related to the context. My Home list stayed at home for a week or so. My Calls list sat right by my phone. My Email list and my Computer lists were at my computer (even though it's only 3 feet from my phone at work). My Errands list was in the car. That meant that when I was at my desk, I could see my Email and Phone lists, and then decide which one to tackle. Paper has the wonderful way of being permanently visible, if you let it, so having this kind of visible bookmark might help you to begin to develop the habit of checking your context lists.
I wholeheartedly second the idea of separating collecting from processing. Don't process every time you have a thought. Instead, just write it down, toss it into an inbox, and forget about it until you process the inbox. That will let your creative mind continue to have thoughts without losing them, but will give you the right opportunity to later process (think about) those thoughts and figure out how to act on them.
That's a random smattering. Best of luck.
