I think we're very much in the same boat -- I just followed up on the "one-person team" problem in another thread. :) I'm not closely monitored, and I don't usually have a lot of deadline pressure. My time is my own, more or less, as long as I get some work done.

I build my task list for the day from my whole Next Action list -- instead of choosing actions in the moment, I pre-select my actions for the day. These actions will include the things that must be done today, as well as whatever other stuff I want to move forward. In your example, I would have my day-specific stuff, plus some stuff chosen semi-randomly from those other projects. I might choose the wedding registry, to keep the Significant Other happy. :)

As you might guess from my signature, I tend to procrastinate. With a small daily list, I don't face the paralysis that comes from looking at all the possible things I could do at work -- I have my list, and I can just work it from the top down. Time spent choosing what to do is time spent not doing, which isn't productive.

I wonder if GTD works better for people with a fair amount of hard landscape stuff. When our time doesn't come in "weird windows," we face this problem.